-lgem must appear after -lldg

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40825

configure.in

@@ -1626,7 +1626,7 @@ CheckAtariLdg()
         AC_CHECK_LIB(ldg, ldg_open, have_ldg_lib=yes, have_ldg_lib=no, -lgem)
         if test x$have_ldg_hdr = xyes -a x$have_ldg_lib = xyes; then
             CFLAGS="$CFLAGS -DENABLE_LDG"
-            SYSTEM_LIBS="$SYSTEM_LIBS -lldg"
+            SYSTEM_LIBS="$SYSTEM_LIBS -lldg -lgem"
         fi
     fi
 }