xorg-server: Add patches to fix security issues
Patch xorg-server (and sub ports) to fix recently discovered security isses:
CVE-2020-14360 and CVE-2020-25712.
These issues can lead to privileges elevations for authorized clients
on systems where the X server is running privileged.
Tested by: adridg, tcberner, mikael
Approved by: ports-secteam (joenum)