MVK: update libvlc to fix crashes when displaying subpictures

buildMobileVLCKit.sh

@@ -14,7 +14,7 @@ CONFIGURATION="Release"
 NONETWORK=no
 SKIPLIBVLCCOMPILATION=no
 
-TESTEDHASH=4acdfca5a
+TESTEDHASH=c2699feec
 
 usage()
 {