Modular build: Switch to using Git sources instead of tarballs + patches
Modular build: Switch to using Git sources instead of tarballs + patches

This matches the recent change to tools/Makefile.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=1132
TEST="python build.py -b" as run by trybots

Review URL: http://codereview.chromium.org/6519037

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@4346 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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