Update comment on dir sorting (will squash).

python/lsst/sconsUtils/scripts.py

@@ -115,7 +115,7 @@ def initialize(cls, packageName, versionString=None, eupsProduct=None, eupsProdu
                 dirs[:] = []
                 continue
             dirs[:] = [d for d in dirs if not d.startswith('.')]
-            dirs.sort()  # happy coincidence that include < libs < python < tests
+            dirs.sort()  # os.walk order is not specified, but we want builds to be deterministic
             if "SConscript" in files:
                 scripts.append(os.path.join(root, "SConscript"))
         if sconscriptOrder is None: