cogl/winsys: Remove eglGetProcAddress workaround for EGL < 1.5 #760
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eglGetProcAddress()used to not work for core API in EGL versionsbelow 1.5. The workaround in place in turn can fail - notably for setups
with a local Mesa build in /usr/local.
EGL 1.5 is almost 10 years old and similar workarounds don't seem to be
in place for toolkits we rely on, notably GTK4. Thus remove it.
Based on
GNOME/mutter@683e917
and
GNOME/mutter@656b836