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Platform GBM support eglGetDisplay

Kyle Brenneman requested to merge github/fork/evelikov/egl-platform-gbm-support into master

Created by: evelikov

The title says it all - the series addresses the missing support for GBM in GLVND.

Without it, older X (glamor in particular) and other applications that use eglGetDisplay() fail.

Furthermore due to a typo/thinko in the EGL_PLATFORM strings, one couldn't even force the correct platform. To top it up eglGetPlatformDisplay attrib_list was going to /dev/null.

FWIW the existing dladdr() trick is broken by design, since it will return false-positive even if one is using $plat_a while linking against correct $library_b. But that's topic for another day.

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