Fix building on old gnu/linux systems #2649
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Fixes #2495:
time.h
were not setting_GNU_SOURCE
, so builds failed asCLOCK_REALTIME
andCLOCK_MONOTONIC
were not definedlinux/input-event-codes.h
was added around 2015 to kernel tree, so it is not available in the old systems in question (Building GLFW 3.4 fails on manylinux2014 and manylinux2010 #2495 referencesmanylinux2014
)O_CLOEXEC
was also undeclared without_GNU_SOURCE
defined