Move chk_vfo_executed so it will work without readline support

https://github.com/Hamlib/Hamlib/issues/326

tests/rigctl_parse.c

@@ -94,9 +94,10 @@ extern int read_history();
 #define ARG_IN  (ARG_IN1|ARG_IN2|ARG_IN3|ARG_IN4)
 #define ARG_OUT (ARG_OUT1|ARG_OUT2|ARG_OUT3|ARG_OUT4)
 
+static int chk_vfo_executed;
+
 /* variables for readline support */
 #ifdef HAVE_LIBREADLINE
-static int chk_vfo_executed;
 static char *input_line = (char *)NULL;
 static char *result = (char *)NULL;
 static char *parsed_input[sizeof(char *) * 5];