Add setvbuf to rigctl.c and rigctld.d to overcome non-buffering of stderr on mingw builds.

Should also speed up other OS's too since only 1 flush will be executed instead of 2

tests/rigctl.c

@@ -151,6 +151,10 @@ int main(int argc, char *argv[])
     int ext_resp = 0;
     int i;
     char rigstartup[1024];
+    char vbuf[1024];
+
+    int err = setvbuf(stderr, vbuf, _IOFBF, sizeof(vbuf));
+    if (err) rig_debug(RIG_DEBUG_ERR, "%s: setvbuf err=%s\n", __func__, strerror(err));
 
     while (1)
     {

tests/rigctld.c

@@ -267,6 +267,7 @@ int main(int argc, char *argv[])
     char host[NI_MAXHOST];
     char serv[NI_MAXSERV];
     char rigstartup[1024];
+    char vbuf[1024];
 #if HAVE_SIGACTION
     struct sigaction act;
 #endif
@@ -282,6 +283,10 @@ int main(int argc, char *argv[])
 
     is_rigctld = 1;
 
+    int err = setvbuf(stderr, vbuf, _IOFBF, sizeof(vbuf));
+    if (err) rig_debug(RIG_DEBUG_ERR, "%s: setvbuf err=%s\n", __func__, strerror(err));
+
+
     while (1)
     {
         int c;