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glGetString on EGL always returns NULL on GLES2

Moving here from a bug observed in Firefox (https://bugzilla.mozilla.org/show_bug.cgi?id=1689207#c10).

If the GLES version is 2.0, glGetString used in EGL will return NULL while it appears to work normal on GLX (tested only on Intel). It does not matter which GL version is supported.

This can be easily tested by setting MESA_GLES_VERSION_OVERRIDE=2.0 and running Firefox nightly with either MOZ_ENABLE_WAYLAND=1 or MOZ_X11_EGL=1 - haven't found another reproducer yet as eglinfo doesn't use it (while glxinfo does).

This apparently affects a lot of older hardware.

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