aplay - Include missing time.h for time()

With salsa-lib,
  aplay.c: In function ‘compute_max_peak’:
  aplay.c:1207: warning: implicit declaration of function ‘time’

aplay/aplay.c

@@ -37,6 +37,7 @@
 #include <ctype.h>
 #include <errno.h>
 #include <limits.h>
+#include <time.h>
 #include <locale.h>
 #include <alsa/asoundlib.h>
 #include <assert.h>