Fix RIG_FLUSH_REMOVE #ifdef -- duh....

https://github.com/Hamlib/Hamlib/pull/712

src/misc.c

@@ -1907,7 +1907,7 @@ int HAMLIB_API parse_hoststr(char *hoststr, char host[256], char port[6])
 #undef RIG_FLUSH_REMOVE
 int HAMLIB_API rig_flush(hamlib_port_t *port)
 {
-#ifdef RIG_FLUSH_REMOVE
+#ifndef RIG_FLUSH_REMOVE
     rig_debug(RIG_DEBUG_TRACE, "%s: called for %s device\n", __func__,
               port->type.rig == RIG_PORT_SERIAL ? "serial" : "network");