Patch protobuf to use proper atomics implementation under arm-nacl-gcc
Patch protobuf to use proper atomics implementation under arm-nacl-gcc

The upstream protobuf package has a __pnacl__ condition and uses
intrinsics for atomic operations in that configuration.  But for
ARM, it tries to use an ARM/Linux-specific version that does not
work under NaCl.

R=sbc@chromium.org
BUG=

Review URL: https://codereview.chromium.org/103323002

git-svn-id: 84b3587ce119b778414dcb50e18b7479aacf4f1d@1291 7dad1e8b-422e-d2af-fbf5-8013b78bd812

kuscsik/naclports,binji/naclports,binji/naclports,kuscsik/naclports,yeyus/naclports,Schibum/naclports,kuscsik/naclports,Schibum/naclports,Schibum/naclports,dtkav/naclports,yeyus/naclports,dtkav/naclports,kuscsik/naclports,Schibum/naclports,binji/naclports,yeyus/naclports,yeyus/naclports,Schibum/naclports,dtkav/naclports,yeyus/naclports,yeyus/naclports,Schibum/naclports,kuscsik/naclports,dtkav/naclports,dtkav/naclports,binji/naclports,binji/naclports