include/tinyalsa/plugin.h: include time.h

Older versions of linux's API header sound/asound.h accidentally rely on
indirect declaration of struct timespec, which isn't reliable, so
include time.h before it to support older versions of sound/asound.h
properly

include/tinyalsa/plugin.h

@@ -33,6 +33,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <sys/types.h>
+#include <time.h>
 
 #include <sound/asound.h>