opengles emulator: Call XInitThreads on Linux.

All the X calls we do on linux are made from the FrameBuffer
object which is locked however OpenGL implementations may call
to Xlib during gl function calls. In order to be thread safe
we initialize Xlib to support multi-threading.

Change-Id: I3bc6a6378d7558fec44052bd67388beaf270c107
1 file changed