Revert r1161, "support ARCHS with one element in the make and ninja generators."
Revert r1161, "support ARCHS with one element in the make and ninja generators."

This didn't work, since even if ARCHS has only one element, dependent targets
might have been built for a different arch.

BUG=90185,107027
Review URL: https://chromiumcodereview.appspot.com/9296036
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp