drm backend: choose correct EGL config with mesa-18
Do not blindly select first EGL config from returned list, but choose the one that matches GBM surfaces, that will be created later. GBM surfaces are created with GBM_FORMAT_XRGB8888 format, so choose the config that matches it. With wrong format EglGbmBackend::resetOutput() will later fail with error EGL_BAD_MATCH. Test Plan: Compile, run startplasmacompositor. Verify that OpenGL compositing is used, either by kwin debug console, or by kwin support information. Reviewers: graesslin, davidedmundson, #kwin, #plasma_on_wayland, bshah Reviewed By: davidedmundson Subscribers: zzag, kwin, #kwin Tags: #kwin, #plasma_on_wayland Differential Revision: https://phabricator.kde.org/D11758
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