Set svn:executable bit on scripts that are executable.

ppapi/cpp/documentation/doxy_cleanup.py

Index: ppapi/cpp/documentation/doxy_cleanup.py
diff --git a/ppapi/cpp/documentation/doxy_cleanup.py b/ppapi/cpp/documentation/doxy_cleanup.py
old mode 100644
new mode 100755
index 9ed7ae65b50c1178ce1917cd3071e32171954bf2..24ddb3c306cb6ee2f9f760076b47daec859b2c31
--- a/ppapi/cpp/documentation/doxy_cleanup.py
+++ b/ppapi/cpp/documentation/doxy_cleanup.py
@@ -1,5 +1,4 @@
-#!/usr/bin/python
-
+#!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -138,5 +137,6 @@ def main():
 
   return 0
 
+
 if __name__ == '__main__':
   sys.exit(main())