use alternate argument syntax for restrict with lio_listio

for some reason I have not been able to determine, gcc 3.2 rejects the
array notation. this seems to be a gcc bug, but since it's easy to
work around, let's do the workaround and avoid gratuitously requiring
newer compilers.

src/aio/lio_listio.c

@@ -67,7 +67,7 @@ static void *wait_thread(void *p)
 	return 0;
 }
 
-int lio_listio(int mode, struct aiocb *restrict const cbs[restrict], int cnt, struct sigevent *restrict sev)
+int lio_listio(int mode, struct aiocb *restrict const *restrict cbs, int cnt, struct sigevent *restrict sev)
 {
 	int i, ret;
 	struct lio_state *st=0;