WIP: Resolve regressions from dropping src/mesa/drivers/x11
Overall switching to the gallium fake-glx is an improvement, but there are a handful of low-impact regressions still. This MR will be repurposed to tracking their fixes, as well as tracking and resolving any other regressions that are reported.
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glx/glx-copy-sub-buffer: fail !9140 (merged) -
glx/glx-egl-switch-context: crash -
glx/glx-multi-context-single-window: fail -
spec/!opengl 1.1/linestipple/line strip: fail -
spec/!opengl 1.1/polygon-mode-offset: fail -
spec/arb_pixel_buffer_object/cubemap npot pbo: fail -
spec/arb_pixel_buffer_object/cubemap pbo: fail -
spec/arb_texture_cube_map/cubemap npot: fail -
spec/ext_framebuffer_multisample/enable-flag: fail -
spec/ext_timer_query/time-elapsed: fail