change /include and -I values from [.config] to [.config.] (this
trailing period works with GNU C's preprocessor but not with VAX C's).
From-SVN: r3375
(CC,CFLAGS,LIBS): Add commented command
variants for bootstrapping gcc-cpp and gcc-cc1 with VAXC.
(alloca): Build alloca.obj from alloca.c if LIBS needs it.
From-SVN: r1923
