Follow symlinks in findleaves

If we replace the project directories with symlinks to the actual
directories, everything should build fine.  Unfortunately, without
this fix, it does not.

Change-Id: Id19fef9696d0f599a7b3a14b6a8fc10ae857f9c7

tools/findleaves.py

@@ -28,7 +28,7 @@ def perform_find(mindepth, prune, dirlist, filename):
   pruneleaves = set(map(lambda x: os.path.split(x)[1], prune))
   for rootdir in dirlist:
     rootdepth = rootdir.count("/")
-    for root, dirs, files in os.walk(rootdir):
+    for root, dirs, files in os.walk(rootdir, followlinks=True):
       # prune
       check_prune = False
       for d in dirs: