GL doesn't work properly in Nightly GLX_TEST_FAILED

[colemickens]

Hi.

I get a bunch of GL failures in Firefox Nightly that I don't see in stable builds. I've been observing this for a long time, and I don't think it's a matter of regressions in nightly, instead I think it's something maybe missing from how we patch the pre-built binary used for firefox-nightly?

Across a variety of machines, I get FEATURE_FAILURE_GLXTEST_FAILED for failureid for lots of gfx.backlist... entries. These don't happen on stable and WebRender, etc seem to work fine.