Make response files depend on their directories, so that -jN works.

Thanks to Olaf Janssen for the report.


[SVN r29442]

tools/build

@@ -1 +1 @@
-Subproject commit b5f1e430388d82990ff7966ac8092231b7aafad5
+Subproject commit dbc509de5904268272495929dfa40413d536c3f8