Fix python scripts in src/build/

build/linux/rewrite_dirs.py

-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2009 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.
 
 """Rewrites paths in -I, -L and other option to be relative to a sysroot."""
 
 import sys
 import os
 import optparse
 
@@ skipping 12 matching lines @@
   sysroot = opts.sysroot
   prefix = opts.strip_prefix
   if os.path.isabs(path) and not path.startswith(sysroot):
     if path.startswith(prefix):
       path = path[len(prefix):]
     path = path.lstrip('/')
     return os.path.join(sysroot, path)
   else:
     return path
 
+
 def RewriteLine(line, opts):
   """Rewrites all the paths in recognized options."""
   args = line.split()
   count = len(args)
   i = 0
   while i < count:
     for prefix in REWRITE_PREFIX:
       # The option can be either in the form "-I /path/to/dir" or
       # "-I/path/to/dir" so handle both.
       if args[i] == prefix:
         i += 1
         try:
           args[i] = RewritePath(args[i], opts)
         except IndexError:
           sys.stderr.write('Missing argument following %s\n' % prefix)
           break
       elif args[i].startswith(prefix):
         args[i] = prefix + RewritePath(args[i][len(prefix):], opts)
     i += 1
 
   return ' '.join(args)
 
+
 def main(argv):
   parser = optparse.OptionParser()
   parser.add_option('-s', '--sysroot', default='/', help='sysroot to prepend')
   parser.add_option('-p', '--strip-prefix', default='', help='prefix to strip')
   opts, args = parser.parse_args(argv[1:])
 
   for line in sys.stdin.readlines():
     line = RewriteLine(line.strip(), opts)
     print line
   return 0
 
+
 if __name__ == '__main__':
   sys.exit(main(sys.argv))