Put -X into MAKEFLAGS on FreeBSD and Mac OS X; they have a small ARG_MAX.

Make the null rule execute something so make is appeased if the .y file is
newer than the checked in .c file. Otherwise make errors out.

Add autoconf as a host tool, not built by default.

Don't put commands in the suffix rule override (avoids target graph cycles).
Protect from multiple inclusion.

Remove local addition mistake in previous.

Use ${_srcdir} in .MADE, and add "Makefile" to the list.

Make the wrapper work correctly for groff too, which uses a rather freaky
Makefile layout.

Make sure the wrapper is used recursively. -f is not propagated to MAKEFLAGS.

Major overhaul of src/tools and host toolchain. Summary of changes:

* Rewrite src/tools Make logic to work like the rest of the tree wrt
"dependall" and "install". The old "make build" hack is g

Major overhaul of src/tools and host toolchain. Summary of changes:

* Rewrite src/tools Make logic to work like the rest of the tree wrt
"dependall" and "install". The old "make build" hack is gone.

* Remove the MKTOOLS logic. This was linked to the "make build" hack,
and was only needed because TOOLDIR originally had no writable default.

* Redo the GNU configure/make logic to make it fit reasonably in a
BSD make wrapper. Use new ${.ALLTARGETS} variable to scan for
targets in $(srcdir), and mark them with .MADE: to prevent rebuilding.

* Only build cross tools in src/tools; remove some messy logic in
src/usr.* and src/gnu/usr.* that would do target filename rewriting
(improves consistency and readability).

* Add the ability to build cross gdb at tool build time by setting
MKCROSSGDB (default no) to "yes" in mk.conf.

* Add src/tools/groff and set up paths to work with this cross groff.

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