* config/ns32k/xm-pc532-min.h, config/we32k/xm-we32k.h: Delete

	* config/ns32k/xm-pc532-min.h, config/we32k/xm-we32k.h: Delete
	references to the MAXPATHLEN macro.

	* config/alpha/xm-alpha.h, config/arm/xm-arm.h,
	config/i386/xm-cygwin.h, config/xm-linux.h: Delete references to
	the POSIX macro.

	* config/i386/xm-gnu.h, config/xm-gnu.h,
	config/alpha/xm-openbsd.h, config/i386/xm-openbsd.h,
	config/m68k/xm-openbsd.h, config/mips/xm-openbsd.h,
	config/sparc/xm-openbsd.h, config/xm-openbsd.h: Delete empty
	and/or unused files.

	* config.gcc: Define POSIX in xm_defines as appropriate in lieu of
	doing so in various xm-*.h files.

f:
	* com.c: Don't rely on the POSIX macro to define autoconf stuff.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@40323 138bc75d-0d04-0410-961f-82ee72b054a4