This header is never exported and belongs to OS layer, thus no need to have it
in include/ directory, where all the public ones are - better off under os/.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1350>
Enrico Weigelt, metux IT consult