Enable/disable various dirs in src-release.sh

gold needs to be enabled for a binutils release, but it's rather odd
to do so for gas, gdb or sim.  This patch passes various --enable and
--disable options depending on the directories being released.

	* src-release.sh (do_proto_toplev): Revert last patch.  Enable or
	disable binutils, gas, gdb, gold, gprof, ld, libdecnumber, readline,
	and sim depending on $tool and $support_files.  Echo configure line.
diff --git a/src-release.sh b/src-release.sh
index 80c1c33..5f15de3 100755
--- a/src-release.sh
+++ b/src-release.sh
@@ -82,8 +82,18 @@
 	-e '/^	install-texinfo /d' \
 	<Makefile.in >tmp
     mv -f tmp Makefile.in
-    #
-    ./configure --target=i386-pc-linux-gnu --enable-gold --enable-ld
+    # configure.  --enable-gold is needed to ensure .c/.h from .y are
+    # built in the gold dir.  The disables speed the build a little.
+    enables=
+    disables=
+    for dir in binutils gas gdb gold gprof ld libdecnumber readline sim; do
+	case " $tool $support_files " in
+	    *" $dir "*) enables="$enables --enable-$dir" ;;
+	    *) disables="$disables --disable-$dir" ;;
+	esac
+    done
+    echo "==> configure --target=i386-pc-linux-gnu $disables $enables"
+    ./configure --target=i386-pc-linux-gnu $disables $enables
     $MAKE configure-host configure-target \
 	ALL_GCC="" ALL_GCC_C="" ALL_GCC_CXX="" \
 	CC_FOR_TARGET="$CC" CXX_FOR_TARGET="$CXX"