Fix typo

configure.in

@@ -333,6 +333,7 @@ esac
 # If --enable-target-optspace always use -Os instead of -O2 to build
 # the target libraries, similarly if it is not specified, use -Os
 # on selected platforms.
+echo "---${enable_target_optspace}:${target}--" 1>&2
 case "${enable_target_optspace}:${target}" in
   yes:*)
     target_makefile_frag="${target_makefile_frag} config/mt-ospace"
@@ -345,7 +346,7 @@ case "${enable_target_optspace}:${target}" in
     target_makefile_frag="${target_makefile_frag} config/mt-ospace"
     ;;
 # end-sanitize-d30v
-  no:*)
+  no:* | :*)
     ;;
   *)
     echo "*** bad value \"${enable_target_optspace}\" for --enable-target-optspace flag; ignored" 1>&2