Fix GCC dependences
Fix GCC dependences

GCC extras are needed to build gcc, not to unpack it.

Makes it possible to safely do 'rm -rf BUILD'.
Review URL: http://codereview.chromium.org/7193014

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5680 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client