configure: allow bulk-disabled things to be re-enabled by dependents

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19401 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -1347,6 +1347,7 @@ for opt do
     --enable-?*|--disable-?*)
     eval $(echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g')
     if is_in $option $COMPONENT_LIST; then
+        test $action = disable && action=unset
         eval $action \$$(toupper ${option%s})_LIST
     elif is_in $option $CMDLINE_SELECT; then
         $action $option