CLSA-2026-1778003374 tigervnc: Fix of 3 CVEs

CVE-2026-33999: fix buffer re-use in xkb XkbSetCompatMap that miscounted valid entries and could cause buffer overflow on subsequent SetCompatMap requests bundled xorg-server - CVE-2026-34001: fix use-after-free in miext/sync miSyncTriggerFence by retaining a ref on the SyncFence across the...