Minor stylistic changes:

  * Removed trailing spaces.
  * Added a comment for code discovering the user's home-directories.
  * Removed a stale regex import.
  * Removed an old corpse 'identity' rule found inside the __test__ rule.

[SVN r42884]

tools/build

@@ -1 +1 @@
-Subproject commit 70e3fd6d793f016a8966effbb326bd41a5bfabe9
+Subproject commit 88de778116cfd2f4b0943c3d449466c792bd81d9