* config.gcc: Update OpenBSD targets.
	* config/openbsd-stdint.h: New file.
	* config/openbsd-libpthread.h: New file.
	* config/openbsd.h: Update and break out LIB_SPEC definition.
	* config/alpha/openbsd.h: Overhaul to reflect ELF migration.
	* config/i386/openbsdelf.h: Correct types.
	* config/m68k/openbsd.h: Likewise.
	* config/mips/openbsd.h: Likewise.
	* config/vax/openbsd.h: Likewise.

From-SVN: r152218