Revert "Fix various mistakes (s/it were/it was/) in manual pages."

This reverts commit e4adeac153e9f588eff22befbf196d2fd3444bc3.

nanosleep.2: List clock_nanosleep() in the NAME section.

Implement clock_nanosleep(2) system call

* Extend the nanosleep1() function in kern_time.c to support the
clock_nanosleep(2) system call. Add {kern,sys}_clock_nanosleep()
functions and update k

Implement clock_nanosleep(2) system call

* Extend the nanosleep1() function in kern_time.c to support the
clock_nanosleep(2) system call. Add {kern,sys}_clock_nanosleep()
functions and update kern_nanosleep() accordingly.

* Add clock_nanosleep() syscall to syscalls.master and regenerate
syscall-related files.

* Update libc symbols with the new syscall.

* Add clock_nanosleep() warpper in libthread_xu.

* Update nanosleep.2 man page to describe clock_nanosleep().

* Update <time.h> and bump __DragonFly_version.

This work is loosely based on the FreeBSD implementation:
https://reviews.freebsd.org/rS315526

This clock_nanosleep(2) syscall passed all tests in the Open POSIX Test
Suite [0]:

conformance/interfaces/clock_nanosleep/1-1: execution: PASS
conformance/interfaces/clock_nanosleep/1-2: execution: PASS
conformance/interfaces/clock_nanosleep/1-3: execution: PASS
conformance/interfaces/clock_nanosleep/1-4: execution: PASS
conformance/interfaces/clock_nanosleep/1-5: execution: PASS
conformance/interfaces/clock_nanosleep/2-1: execution: PASS
conformance/interfaces/clock_nanosleep/2-2: execution: PASS
conformance/interfaces/clock_nanosleep/2-3: execution: PASS
conformance/interfaces/clock_nanosleep/3-1: execution: PASS
conformance/interfaces/clock_nanosleep/4-1: execution: PASS
conformance/interfaces/clock_nanosleep/5-1: execution: PASS
conformance/interfaces/clock_nanosleep/6-1: execution: PASS
conformance/interfaces/clock_nanosleep/9-1: execution: PASS
conformance/interfaces/clock_nanosleep/8-1: execution: PASS
conformance/interfaces/clock_nanosleep/10-1: execution: PASS
conformance/interfaces/clock_nanosleep/11-1: execution: PASS
conformance/interfaces/clock_nanosleep/13-1: execution: PASS
conformance/interfaces/clock_nanosleep/15-1: execution: PASS

[0] Open POSIX Test Suite: http://posixtest.sourceforge.net/

Reviewed-by: swildner, dillon, tuxillo, zach

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Use ${} instead of $() in various makefiles

Also use ${.TARGET} and ${.ALLSRC] wherever impossible.

Minor style adjustment in at(1)'s makefiles.

Fix various mistakes (s/it were/it was/) in manual pages.

libutil/setusercontext: Apply FreeBSD's b149798e50fac1113a7.

FBSD commit msg:

Fix a clang 3.5 warning about abs(3) being given an argument of type
quad_t in setusercontext(). While here, sanitize

libutil/setusercontext: Apply FreeBSD's b149798e50fac1113a7.

FBSD commit msg:

Fix a clang 3.5 warning about abs(3) being given an argument of type
quad_t in setusercontext(). While here, sanitize the clamping of the
priority value, and use the correct type for the return value of
login_getcapnum().

show more ...

libc/citrus: Cleanup the DFprivate_1.0 section of the Symbol.map.

None of these symbols were ever in our libc.

libc/citrus: Remove two unused header files.

libc/citrus: Fix some typos in DFprivate_1.0 in the Symbol.map.

sockaddr_snprintf.3: Use .Er for errno values.

Fix some -Wjump_misses_init warnings (found by clang).

libutil: Add sockaddr_snprintf() (taken from NetBSD).

The man page has been adjusted a bit since we don't support Apple Talk
protocol.

setbuf.3: Mention stdbuf(1) and update HISTORY & BUGS sections

Obtained-from: FreeBSD
Reported-by: swildner

Import stdbuf(1) together with libstdbuf(3) from FreeBSD

The stdbuf(1) is a utility to change the initial buffering of stdin,
stdout and stderr streams for a given command. It achieves this
functio

Import stdbuf(1) together with libstdbuf(3) from FreeBSD

The stdbuf(1) is a utility to change the initial buffering of stdin,
stdout and stderr streams for a given command. It achieves this
functionality by preloading the libstdbuf(3) library and configuring the
needed environment variables. Under the hood, libstdbuf(3) library
calls setvbuf(3) to do the actual work.

Changes from FreeBSD:
* Removed 32bit i386 code from stdbuf(1)
* Fix typos and update HISTORY section in libstdbuf.3 man page
* Update the example to actually work on DragonFly

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libc/gen/devname.c: No need to include <paths.h>

devname.3: Add a little example

Obtained from FreeBSD but with some updates.

devname(3): Remove obsolete code that queries dev.db

In the old days of static /dev, devname(3) would get the name by
querying the /var/run/dev.db created by dev_mkdb(8). Now that we have
dynamic /

devname(3): Remove obsolete code that queries dev.db

In the old days of static /dev, devname(3) would get the name by
querying the /var/run/dev.db created by dev_mkdb(8). Now that we have
dynamic /dev provided by devfs(5), the device name is provided by the
'kern.devname' sysctl, thus obsoleting the db query code.

I've tested to verify that the db query code isn't being used now. So
it's safe to remove this obsolete code. Cleanups to dev_mkdb(8) and
related code would follow.

Meanwhile, update the man page to reflect the current code.

Discussed-with: swildner

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libc/gen/gen_private.h: Include <sys/types.h> for off_t.

Do not rely on the including file to bring it in.

libc/fmtcheck: Sync with FreeBSD (only comments).

devname.3: Update man page to align wht the code

build - Fix building new sources on older systems

* Fix compile errors when doing a new buildwolrd on an old
base system.

pthreads: Add pthread_is_threaded_np.3 manpage.

pthreads: Add pthread_yield_np().

Same as non standard pthread_yield() but with correct '_np' suffix.

pthreads: Use sticky version in pthread_is_threaded_np().

It was observed that several applications have undefined behaviour if
they become implicitly threaded at runtime (e.g. locale libraries).

pthreads: Use sticky version in pthread_is_threaded_np().

It was observed that several applications have undefined behaviour if
they become implicitly threaded at runtime (e.g. locale libraries).
This allows to check status to avoid issues in applications calling
sigprocmask() and fork() without immediate exec().

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world: Add <sys/single_threaded.h>

The __libc_single_threaded is publicly exported version of libc private
__isthreaded symbol that does not reset on fork in threaded programs.