package/x11r7/xserver_xorg-xserver: drop obsolete patch

package/x11r7/xserver_xorg-xserver: drop obsolete patch

Drop second patch following upstream review:
https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/555

Indeed, this patch has been dropped from openembedded since 2018 because
"it is forcing input to use SIGIO, despite the fact that since 2015
xserver has used an input thread.":
https://github.com/openembedded/openembedded-core/commit/cde11398e6d74ad8f27334199b4bd99cdf1f0ff7

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>