gallium/util: remove unused header from u_queue.c

Reviewed-by: Plamena Manolova <plamena.manolova@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/auxiliary/util/u_queue.c

@@ -27,7 +27,6 @@
 #include "u_queue.h"
 #include "u_memory.h"
 #include "u_string.h"
-#include "os/os_time.h"
 
 static void util_queue_killall_and_wait(struct util_queue *queue);