[r=dave-cheney],[bug=1304767] Fix 1304767
Testing that --upload-tools
rejects building tools for
ppc64 when on amd64 fails
when the test is run on an
actual ppc64. In other
words, the test assumes a
hostArch of amd64. Fix
this by patching hostArch
to amd64.
https://codereview.appspot.com/86760043/