Make scripts executable by python2.

scripts/msvs_projects.py

-#!/usr/bin/python
+#!/usr/bin/python2
 #
 # Copyright 2017 The ANGLE Project Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -37,4 +37,4 @@ for potential_dir in os.listdir(out_dir):
 # Run the helper utility that merges the projects.
 args = ['python', os.path.join('build', 'win', 'gn_meta_sln.py')]
 print('Running "' + ' '.join(args) + '"')
-subprocess.call(args)
+subprocess.call(args)
\ No newline at end of file

scripts/run_code_generation.py

-#!/usr/bin/python
+#!/usr/bin/python2
 #
 # Copyright 2017 The ANGLE Project Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -178,4 +178,4 @@ if any_dirty:
         args += ['git']
     args += ['cl', 'format']
     print('Calling git cl format')
-    subprocess.call(args)
+    subprocess.call(args)
\ No newline at end of file