Makefile.am (CFILES): Add cxxfilt.c.

Makefile.am (CFILES): Add cxxfilt.c.

binutils:
	* Makefile.am (CFILES): Add cxxfilt.c.
	(cxxfilt_SOURCES): Now just cxxfilt.c $(BULIBS).
	(cxxfilt_LDADD): Delete.
	Remove all references to underscore.c.
	Regen dependencies.
	* configure.in: Define TARGET_PREPENDS_UNDERSCORE in
	config.h from $UNDERSCORE, rather than AC_SUBSTing it.
	* binutils/cxxfilt.c: Moved here from gcc/cp, minor
	adjustments to fit into binutils framework.
	* configure, config.in, Makefile.in, doc/Makefile.in: Regenerate.

gcc/cp:
	* Make-lang.in: Remove all references to the demangler.
	* cxxfilt.c: Moved to binutils.

From-SVN: r57235