use mmap to allocate memory for generated code to be able to set PROT_EXEC

code/qcommon/vm.c

@@ -615,6 +615,9 @@ VM_Free
 */
 void VM_Free( vm_t *vm ) {
 
+	if(vm->destroy)
+		vm->destroy(vm);
+
 	if ( vm->dllHandle ) {
 		Sys_UnloadDll( vm->dllHandle );
 		Com_Memset( vm, 0, sizeof( *vm ) );