Improve stage rule, allowing to specify location in requirements. This

allows short name for stage targets which install to global locations.


[SVN r17508]

tools/build

@@ -1 +1 @@
-Subproject commit e02e18061ff78e5ebb3f1b96cb68fb11c5502202
+Subproject commit e6fd724bd8c75471ea7026b39205b1d8fad62740