Support NetBSD m68K ELF targets

* mpi/config.links (m68k*-*-netbsdelf): New.

--

The original patch from NetBSD had this additional code:

	if ! test x$M68060 = xYES; then
	    path="m68k/mc68020 m68k"
	fi

However, this bypasses the config system.  It would be better to add
proper support for this CPU to config.sub.

mpi/config.links

@@ -8,12 +8,12 @@
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
-# 
+#
 # GnuPG is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
-# 
+#
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, see <http://www.gnu.org/licenses/>.
 
@@ -194,6 +194,11 @@ case "${host}" in
 	cat  $srcdir/mpi/m68k/syntax.h	    >>./mpi/asm-syntax.h
 	path="m68k"
 	;;
+    m68k*-*-netbsdelf)
+	echo '#define ELF_SYNTAX'           >>./mpi/asm-syntax.h
+	cat  $srcdir/mpi/m68k/syntax.h	    >>./mpi/asm-syntax.h
+	path="m68k"
+	;;
     m68k-atari-mint)
 	echo '#define MIT_SYNTAX'           >>./mpi/asm-syntax.h
 	cat  $srcdir/mpi/m68k/syntax.h	    >>./mpi/asm-syntax.h