[3.12] main/xen: add upstream XSA patches
There may not be a Xen 4.13.5 release, at least not before v3.12 EoL, but the upstream stable-4.13
branch has these patches.
https://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=SUPPORT.md;hb=refs/heads/stable-4.13
https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.13
Edited by omni