PATCH: Re-enable building libg++

[Jason Merrill]

What about the Makefile.in support removed by

Tue Mar 24 16:58:29 1998  Jason Molenda  (crash@bugshack.cygnus.com)

        * Makefile.in (TARGET_CONFIGDIRS, ALL_TARGET_MODULES,
        CONFIGURE_TARGET_MODULES, CHECK_TARGET_MODULES,
        INSTALL_TARGET_MODULES, CLEAN_TARGET_MODULES, all-target-winsup):
        Remove references to librx and libg++.

?  Isn't that necessary, too?

Jason