New builtins USER_MODULE and NEAREST_USER_LOCATION. V2 changes and

explanations are coming later.


[SVN r26466]

tools/build

@@ -1 +1 @@
-Subproject commit 988802a0ab879a837e3633857f19b169a14dfc49
+Subproject commit 49aa05d3b4ec6e31b4048b3118f81c4ec4c05966