Weaken check for unused sources for libraries -- so that we don't warn

the statically linked library bypasses library sources.


[SVN r21960]

tools/build

@@ -1 +1 @@
-Subproject commit d1cda1623c7fba3465c9f0e769652903c561056d
+Subproject commit 0576fe7b266f1f901554df2120da55bb9682ed68