[mingw-angleproject/f19] (3 commits) ...Update to 20130517 snapshot (r2215)

[Erik van Pienbroek]

Summary of changes:

  2f2c5bb... Another gyp b0rkedness workaround (*)
  fb8bed7... Set the environment variables before running gyp (*)
  cfc0c71... Update to 20130517 snapshot (r2215) (*)

(*) This commit already existed in another branch; no separate mail sent