configure.ac (--enable-gold): Support both, both/gold and both/bfd to add gold to configdirs without removing ld.

        * configure.ac (--enable-gold): Support both, both/gold and
        both/bfd to add gold to configdirs without removing ld.
        * configure: Regenerated.

        * Makefile.def: Add install-gold dependency to install-ld.
        * Makefile.in: Regenerated.

Co-Authored-By: H.J. Lu <hongjiu.lu@intel.com>

From-SVN: r158786