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gl-renderer: Improve GPU profiling accuracy

Loïc Molinari requested to merge molinari/weston:polish_gpu_profile into main

GPU profiling of the GL renderer is rather inaccurate because it uses fence syncs to measure GPU timings. This merge request tries to improve the situation by using the GL_EXT_disjoint_timer_query extension to retrieve more accurate GPU timings.

Fixes #342 (closed)

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