mesa: Implement a new GL_MESA_tile_raster_order extension.
The intent is to use this extension on vc4 to allow X11 to do overlapping CopyArea() within a pixmap without first blitting the pixmap to a temporary. With associated glamor patches, improves x11perf -copywinwin100 performance on a Raspberry Pi 3 from ~4700/sec to ~5130/sec, and is an even larger boost to uncomposited window movement performance (most copywinwin100 copies don't overlap). v2: Fix glIsEnabled() on the new enums. v3: Drop the local spec since I'm upstreaming the spec. Reviewed-by: Nicolai Hähnle <email@example.com>
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