Makefile.in (LANGUAGES): Remove c++.

        * Makefile.in (LANGUAGES): Remove c++.
        (SUBDIRS): New variable.
        (LEX, LEXFLAGS): Ditto.
        (MAKEOVERRIDES): Ditto.
        (COMPILERS): Remove cc1plus.
        (LANG_MAKEFILES, LANG_STAGESTUFF, LANG_DIFF_EXCLUDES, FLAGS_TO_PASS):
        New variables.
        (CPLUS_OBJS, CPLUS_TREE_H, C++, c++, g++, g++-cross, cc1plus,
        cp-*.o, g++.o, gplus.info): Deleted.
        (STAGESTUFF): Remove g++, g++-cross, cc1plus.  Add $(LANG_STAGESTUFF).
        (Makefile): Depend on $(LANG_MAKEFILES).
        (####language hooks, ####language fragments): New spots for sed
        to insert things.
        (all.cross, all.build, start.encap, rest.encap, info, dvi,
        install-normal, install-common, install-info, install-man,
        uninstall, distdir, mostlyclean, clean, distclean, extraclean,
        realclean, stage1, stage2, stage3, stage4): Depend on lang.foo.
        (mostlyclean, clean, distclean, extraclean, realclean): Clean as
        much of the language subdirectories as we can.
        (install-common):  Remove g++ installation.
        (install-man): Remove g++.1 installation.
        (uninstall): Remove g++ reference.
        (TAGS): Remove cp-parse.? reference.
        (distdir): Ditto.
        (distdir-start, distdir-finish): New targets.
        (diff): Remove cp-parse.? reference.  Add $(LANG_DIFF_EXCLUDES).
        (compare, compare3, gnucompare, gnucompare3): Compare language
        subdirectories too.
        (stage1-start, stage2-start, stage3-start, stage4-start): New targets.
        Ensure stage subdirectory exists before processing language
        dependent part.

From-SVN: r7136