Composite Bypass Support Sharply Bumps XMir's Performance

Urban Terror and Warsow also see their performance gaps closed by about half thanks to the composite bypass support being implemented.

When running certain Linux OpenGL games full-screen but lower than the native resolution (where the game is then upscaled to the frame-buffer's size), the composite bypass support doesn't seem to work as shown by these results when running Xonotic at 1280 x 1024 on the System76 Gazelle Pro with its nice 1920 x 1080 panel.