Add struct timeval and timespec definition when _POSIX_C_SOURCE is not defined

FIXME: It might cause problems on some platforms when tv_usec is not long type.

include/global.h

@@ -130,6 +130,18 @@ int snd_shm_area_destroy(struct snd_shm_area *area);
 
 int snd_user_file(const char *file, char **result);
 
+#ifndef _POSIC_C_SOURCE
+struct timeval {
+	time_t		tv_sec;		/* seconds */
+	long		tv_usec;	/* microseconds */
+};
+
+struct timespec {
+	time_t		tv_sec;		/* seconds */
+	long		tv_nsec;	/* nanoseconds */
+};
+#endif
+
 /** Timestamp */
 typedef struct timeval snd_timestamp_t;
 /** Hi-res timestamp */