Merge pull request #2396 from nicolasnoble/win32-is-an-os-too

Calling python to spawn a python subprocess.

tools/buildgen/generate_projects.py

@@ -54,7 +54,7 @@ for root, dirs, files in os.walk('templates'):
       out = out_dir + '/' + os.path.splitext(f)[0]
       if not os.path.exists(out_dir):
         os.makedirs(out_dir)
-      cmd = ['tools/buildgen/mako_renderer.py']
+      cmd = ['python', 'tools/buildgen/mako_renderer.py']
       for plugin in plugins:
         cmd.append('-p')
         cmd.append(plugin)