fuzz: use ITIMER_REAL for timeouts

Using ITIMER_VIRTUAL is a bad idea, if the fuzzer hits a blocking
syscall - e.g. ppoll with a NULL timespec. This causes timeout issues
while fuzzing some block-device code. Fix that by using wall-clock time.
This might cause inputs to timeout sometimes due to scheduling
effects/ambient load, but it is better than bringing the entire fuzzing
process to a halt.

Based-on: <20210713150037.9297-1-alxndr@bu.edu>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>

tests/qtest/fuzz/generic_fuzz.c

@@ -695,7 +695,7 @@ static void generic_fuzz(QTestState *s, const unsigned char *Data, size_t Size)
         while (cmd && Size) {
             /* Reset the timeout, each time we run a new command */
             if (timeout) {
-                setitimer(ITIMER_VIRTUAL, &timer, NULL);
+                setitimer(ITIMER_REAL, &timer, NULL);
             }
 
             /* Get the length until the next command or end of input */