Refactorings.

* build/property-set.jam
  (property-set): Make dependency/non-dependency classification independent
  from base/free/incidental.

* build/targets.jam
  Induced change.


[SVN r22051]

tools/build

@@ -1 +1 @@
-Subproject commit b903dbca2e4ce96cb44bec37e8e3e8076f76bd08
+Subproject commit 9106397e92a40a058795664a253f059abda37a76