ft817: Moving delay value into #define section of the header

yaesu/ft817.c

@@ -886,7 +886,7 @@ int ft817_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 		}
 
 		if (ptt_response != ptt) {
-			usleep(100000l); // Before next try wait for 0.1 seconds. Helps with slower rigs cloning FT817 protocol (e.g. MCHF)
+			usleep(1000l * FT817_RETRY_DELAY); // Wait before next try. Helps with slower rigs cloning FT817 protocol (e.g. MCHF)
 		}
 
 	} while (ptt_response != ptt && retries-- > 0);

yaesu/ft817.h

@@ -52,6 +52,13 @@
  */
 #define FT817_TIMEOUT			3000
 
+/*
+ * Return from TX to RX may have a delay. If status is not changed
+ * on the first attempt, wait this amount of milliseconds before
+ * each next next attempts.
+ */
+#define FT817_RETRY_DELAY		100
+
 /*
  * The time the TX, RX and FREQ/MODE status are cached (in millisec).
  * This optimises the common case of doing eg. rig_get_freq() and