iconv sync 10/x: FreeBSD SVN 258316 + 283406 + 283418

SVN 258316: Bug fixes in iconv(3) UTF-7 support.

- Add ' to the list of directly encoded characters and * to the list of
optionally directly

iconv sync 10/x: FreeBSD SVN 258316 + 283406 + 283418

SVN 258316: Bug fixes in iconv(3) UTF-7 support.

- Add ' to the list of directly encoded characters and * to the list of
optionally directly encoded characters as per RFC 2152.

- In _citrus_UTF7_mbtoutf16 on end of input when the next output character
has only been partially decoded, save a copy of the buffer of input
characters (not just its length). On the next call with more input
characters this buffer is reprocessed together with the new input to
form a fully decoded output character.

- At the end of a base64 encoded sequence fully discard '-' (BASE64_OUT)
by decrementing psenc->chlen and i. This is needed to make room in
psenc->ch (input buffer) in case the next input character starts a new
base64 encoded sequence. And also, if this is the end of input and no
output character can be returned, this brings the encoder in the initial
state as indicated by _citrus_UTF7_stdenc_get_state_desc_generic which
is used by the caller to distinguish between no output and partial
output.

- In _citrus_UTF7_mbrtowc_priv pass the s parameter (input pointer)
directly to _citrus_UTF7_mbtoutf16 instead of a copy (s0). This way s
is updated correctly in case of errors.

- In _citrus_UTF7_mbrtowc_priv when called with psenc->surrogate set
(previous call did not have enough input), retrieve the previously
decoded UTF-16 character fr

SVN 283406: Fix decoding of UTF-7 when a base64 encoded chunk appears at
the end of the input buffer.

_citrus_UTF7_mbtoutf16 stored the decoder state at the beginning so it
could restore this state on an incomplete character such that the next
call would restart the decoding. The problem was that "-" (end of base64
mode) at the end of a string was also treated as an incomplete character
but was also removed from the state buffer. So the initial state would be
restored (with base64 mode) and the next call would no longer see the "-"
so it continued in base64 mode.

This state saving/restoring isn't needed here. It's already handled
elsewhere (citrus_iconv_std.c:_citrus_iconv_std_iconv_convert) so just
remove it.

Also initialise *nresult.

SVN 283418: (continued)

When only 2 bytes can be read from a 4 byte UTF-16 character in a base64
encoded chunk of a UTF-7 string, treat that as an incomplete character and
return an error instead of a shift sequence and no error.

Also check that the low 2 bytes have a valid value.

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iconv sync 9/x: FreeBSD SVN 260003

In libiconv i18n modules, surround the unused static
_citrus_xxx_pack_state() and _citrus_xxx_unpack_state() functions
with #if 0 blocks for now

iconv sync 8/x: FreeBSD SVN 281550

Remove the const qualifier from iconv(3) to comply with POSIX:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iconv.html
Adjust all code that calls icon

iconv sync 8/x: FreeBSD SVN 281550

Remove the const qualifier from iconv(3) to comply with POSIX:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/iconv.html
Adjust all code that calls iconv

Note: The libcpp Makefile cflag was added because the host iconv.h
header was getting pulled in. This always should have been the
src version of iconv.h, but the error wasn't exposed until now.

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locales, libconv: Sync with FreeBSD (extensive reach)

What started out as a relatively simply upgrade to libiconv finally
resulted in a simultaneous overhaul to locales, strings, and stdio.
All of t

locales, libconv: Sync with FreeBSD (extensive reach)

What started out as a relatively simply upgrade to libiconv finally
resulted in a simultaneous overhaul to locales, strings, and stdio.
All of these are interdependent and there is no way to upgrade them
individually or in steps.

These cases are similar to what happened with libm where significant
syncing came from NetBSD previously, rendering contributions from
FreeBSD difficult. Libiconv and locales (both ancient) are now in
sync with FreeBSD HEAD.

As several headers were signficantly updated and the mtree was updated
to accommodate the new include/xlocale directory, this commit will
require a full world build. It also may cause some dports to no longer
build due to prototype differences, but the dports will be adjusted.

The regexp library was not being used. It was removed from FreeBSD four
years ago. Since it required collate updates, I took the opportunity to
remove it completely by adding re_comp functionality to 4.3 compat
library like FreeBSD did.

__DragonFly_version has been bumped to 500300.

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