* configure.in: Define and substitute DEMANGLER_NAME.

	* configure.in: Define and substitute DEMANGLER_NAME.
	* Makefile.am (DEMANGLER_PROG): Set to cxxfilt.
	(man_MANS): Use DEMANGLER_NAME rather than DEMANGLER_PROG.
	(bin_PROGRAMS): Remove $(DEMANGLER_PROG).
	(noinst_PROGRAMS): Add $(DEMANGLER_PROG).
	(cxxfilt_SOURCES): Rename from c__filt_SOURCES.
	(cxxfilt_LDADD): Rename from c__filt_LDADD.
	($(DEMANGLER_NAME).1): Rename from $(DEMANGLER_PROG).1.  Use
	DEMANGLER_NAME rather than DEMANGLER_PROG in substitution.
	(MOSTLYCLEANFILES): Use DEMANGLER_NAME rather than
	DEMANGLER_PROG.
	(install-exec-local): When installing noinst_PROGRAMS, change
	cxxfilt to $(DEMANGLER_NAME).
	* configure, Makefile.in: Rebuild.