Ubreak stdlib=sun-stlport.

This patch makes the feature module check if a feature value
is actually a complete permissible value, before splitting at
'-' and treating each element as subfeature.

Patch from Noel Belcourt.


[SVN r51893]

tools/build

@@ -1 +1 @@
-Subproject commit 00805f73981a3b9d2036ce240dc5930580fc6722
+Subproject commit 5fda052785f8b80944666b818e8b9381d8ebff6e