Move rig_make_md5 to rig.h

extern HAMLIB_EXPORT(char*) rig_make_md5(char *pass);

tests/rigctl_parse.c

@@ -4938,8 +4938,6 @@ declare_proto_rig(pause)
     return (RIG_OK);
 }
 
-extern char *make_md5(char *password);
-
 int rigctld_password_check(RIG *rig, const char *md5)
 {
     int retval = -RIG_EINVAL;

tests/rigctld.c

@@ -237,9 +237,6 @@ static void handle_error(enum rig_debug_level_e lvl, const char *msg)
 #endif
 }
 
-
-extern char *make_md5(char *password);
-
 int main(int argc, char *argv[])
 {
     rig_model_t my_model = RIG_MODEL_DUMMY;