Purge cruft now we have build libiberty.

	* Makefile.in (OBSTACK, VFPRINTF, DOPRINT, STRSTR,
	HOST_OBSTACK, HOST_VFPRINTF, HOST_DOPRINT, HOST_STRSTR,
	USE_HOST_OBSTACK, USE_HOST_VFPRINTF, USE_HOST_DOPRINT,
	USE_HOST_STRSTR): Delete variables.
	(vfprintf.o, doprint.o, strstr.o, splay-tree.o, obstack.o,
	hashtab.o, safe-ctype.o, $(HOST_PREFIX_1)obstack.o,
	$(HOST_PREFIX_1)vfprintf.o, $(HOST_PREFIX_1)doprint.o,
	$(HOST_PREFIX_1)strstr.o), $(HOST_PREFIX_1)): Delete rules.
	(LIBIBERTY, BUILD_LIBIBERTY): New variables.
	(LIBDEPS): Now just $(INTLDEPS) $(LIBIBERTY).
	(LIBS): Now just $(INTLLIBS) @LIBS@ $(LIBIBERTY).
	(HOST_LIBDEPS): Now just $(BUILD_LIBIBERTY).
	(HOST_LIBS): Ditto.
	(HOST_RTL): Remove hashtab.o safe-ctype.o.
	(OBJS): Remove splay-tree.o.
	(gen-protos): Depend on $(HOST_LIBS), not ../libiberty/libiberty.a.
	(distclean): No need to delete splay-tree.c obstack.c
	hashtab.c safe-ctype.c.
	(mostlyclean): Delete build copies of print-rtl.c bitmap.c
	errors.c ggc-none.c (all prefixed with $(HOST_PREFIX_1).
	* aclocal.m4 (gcc_AC_FUNC_VFPRINTF_DOPRNT, gcc_AC_FUNC_STRSTR):
	Delete.
	* configure.in: Don't use them.
	Set and substitute @FORBUILD@.
	* config.in, configure: Regenerate.
	* doprint.c: Move to libiberty/_doprnt.c.
	* doc/configterms.texi: Document that libiberty is now built
	up to three times.  Fix typo.
	* f/Make-lang.in (f/fini, f/intdoc): Depend on $(HOST_LIBDEPS)
	and link with $(HOST_LIBS), not safe-ctype.o.

From-SVN: r47475