Fedora 40: xen 2024-3a36322c4b

update to xen-4.18.1 rebase xen.gcc12.fixes.patch remove patches now included or superceded upstream x86: Register File Data Sampling [XSA-452, CVE-2023-28746] GhostRace: Speculative Race Conditions [XSA-453, CVE-2024-2193]