Olivier Fourdan authored Jul 01, 2019 and Adam Jackson committed Jul 15, 2019

<sys/io.h> on ARM hasn't worked for a long, long time, so it was removed
it from glibc upstream.

Remove the include to avoid a compilation failure on ARM with glibc.
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Closes: xorg/xserver#840