* Makefile.am (BFD64_BACKENDS, BFD64_BACKENDS_CFILES): Add

	* Makefile.am (BFD64_BACKENDS, BFD64_BACKENDS_CFILES): Add
	coffdu-rs6000.{lo,c}.
	(coff-pmac.lo, coff-rs6000.lo, coff64-rs6000.lo): Add dependency
	on xcoff.h
	* Makefile.in: Regenerate.
	* xcoff.h: New file.
	* coff-pmac.c: Use xcoff.h instead of coff-rs6000.c.
	* coff-rs6000.c: Move all declarations and defines that are
	common to the xcoff backends into xcoff.h
	* coff64-rs6000.c: Ditto,