Cleanups.

* new/builtin.jam
  (searched-lib-generator.run): Tweak the logic and change comments.


[SVN r18214]

tools/build

@@ -1 +1 @@
-Subproject commit a9b0dea855c74cc5aea54031bb3a82d3f01caf73
+Subproject commit 6b9905e42faac531ef07426813f802ebddd246cd