Disable set_ptt confirmation logic. Seems many rigs can't deal with it.

https://github.com/Hamlib/Hamlib/issues/623

src/rig.c

@@ -2641,6 +2641,7 @@ int HAMLIB_API rig_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 
                 if (retcode != RIG_OK) { RETURNFUNC(retcode); }
 
+#if 0
                 hl_usleep(50 * 1000); // give PTT a chance to do it's thing
 
                 // don't use the cached value and check to see if it worked
@@ -2656,8 +2657,10 @@ int HAMLIB_API rig_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
                               rigerror(retcode));
                     retcode = RIG_OK; // fake the retcode so we retry
                 }
-
                 if (tptt != ptt) { rig_debug(RIG_DEBUG_WARN, "%s: failed, retry=%d\n", __func__, retry); }
+#else
+                tptt = ptt;
+#endif
             }
             while (tptt != ptt && retry-- > 0 && retcode == RIG_OK);
         }
@@ -2685,9 +2688,13 @@ int HAMLIB_API rig_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 
                     if (retcode != RIG_OK) { RETURNFUNC(retcode); }
 
+#if 0
                     retcode = rig_get_ptt(rig, vfo, &tptt);
 
                     if (tptt != ptt) { rig_debug(RIG_DEBUG_WARN, "%s: failed, retry=%d\n", __func__, retry); }
+#else
+                    tptt = ptt;
+#endif
                 }
                 while (tptt != ptt && retry-- > 0 && retcode == RIG_OK);