Fix for Darwin dylib loading issue.

This updates the emulator prebuilt binaries to include minor
misc fixes, the most important one being the ability to load
the system OpenGL dylib on recent OS X version, which doesn't
have a .dylib prefix.

See README for full details.

BUG=16576673

Change-Id: I89df7f386db9801064ce779e77ba709212f01c77