Add support for following symlinks in make.py

Author: geky

tools/toolchains/__init__.py

@@ -356,7 +356,7 @@ def scan_resources(self, path):
         bottom-up mode the directories in dirnames are generated before dirpath
         itself is generated.
         """
-        for root, dirs, files in walk(path):
+        for root, dirs, files in walk(path, followlinks=True):
             # Remove ignored directories
             for d in copy(dirs):
                 if d == '.hg':