Bugfix: translate path properties even in conditional properties.

* new/property.jam
  (split-conditional): New rule
  (translate-paths): Use the above to handle conditional properties.

* test/path_features.py: New tests.


[SVN r17881]

tools/build

@@ -1 +1 @@
-Subproject commit 4d03dcea6ae49f8cb02051999137cf1ac2a1277e
+Subproject commit f9f7f7443a3e7b6a22fc274d44291e20e9216620