* Makefile.in: Added .PHONY targets where appropriate. Added some

	* Makefile.in: Added .PHONY targets where appropriate.  Added some
	comments.  Also:
	(gcclibdir, version): Removed unused variables.
	(DEP): New variable, set to mkdep.
	(ALL_CFLAGS): New variable.  Used in .c.o target.
	(CFILES, HFILES, GENERATED_CFILES, GENERATED_HFILES): New
	variables.
	(HEADERS, MANSOURCES, LDCSOURCES, GENERATED_SOURCES,
	GENERATED_HEADERS, LDSOURCES, BFD_SOURCES, SOURCES): Removed
	mostly obsolete variables.  Adjusted remaining uses.
	(DEF_EMUL): Removed variable.
	(ldmain.o): Handle undefined EMUL error correctly.
	(ldemul-list.h): Depend on config.status rather than Makefile.
	Create via temporary file.
	(ver960.c, roll, make): Removed obsolete targets.
	(.dep, .dep1, dep.sed, dep, dep-in): New targets.  Used to rebuild
	dependencies.