examples/proxy: include sys/time.h for gettimeofday()

Fixes: e7b18c0 ("examples/proxy: track start and end time")
Signed-off-by: Jens Axboe <[email protected]>

Author: axboe

examples/proxy.c

@@ -35,7 +35,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/socket.h>
-#include <time.h>
+#include <sys/time.h>
 #include <unistd.h>
 #include <liburing.h>