gpm: fix major() build failure due to glibc 2.28

gpm: fix major() build failure due to glibc 2.28

glibc 2.28 no longer includes <sys/sysmacros.h> from <sys/types.h>,
and therefore <sys/sysmacros.h> must be included explicitly when major()
is used.

This commit adds a patch to directly include <sys/sysmacros.h> into
open_console.c file where major() macro is used.

Patch has been taken from gpm upstream commit:
https://github.com/telmich/gpm/commit/b350aee4ea5785a75cb6ad770f6b768c506ebb70

Fixes:
http://autobuild.buildroot.net/results/f53/f5373a567de619375746f1dcfe312971b85bb810/
http://autobuild.buildroot.net/results/227/227a7edf9304d85645d3e7fa0f930fe2e9b6e752/

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>