Usage requirements are now propagated all the way up, not only

to direct dependents. The previous behaviour can be confusing and
there are no use cases where the new behaviour will be bad.

It will add more include paths in some cases, but who cares?


[SVN r26528]

tools/build

@@ -1 +1 @@
-Subproject commit cde2b788a98ba7681f8446887b5c4cd0f822937c
+Subproject commit 5e5c84734d13564bb3af4b68fc1b04f41f6b8bdc