config.table: Make locating frag files failsafe even for the special case if...

�
	* config.table: Make locating frag files failsafe even for the
	special case if configuring and building in srcdir.
	* configure.in: Make locating frag files failsafe even for the
	special case if configuring and building in srcdir.

From-SVN: r18414

libstdc++/configure.in

@@ -65,6 +65,14 @@ case "${target}" in
 esac
 
 for frag in ${frags}; do
+  case ${frag} in
+    ../* )
+      if [ ${srcdir} = . ]; then
+	[ -n "${with_target_subdir}" ] && frag=../${frag}
+	[ -n "${with_multisrctop}" ] && frag=${with_multisrctop}${frag}
+      fi
+      ;;
+  esac
   frag=${srcdir}/config/$frag
   if [ -f ${frag} ]; then
     echo "Appending ${frag} to target-mkfrag"