xtconq setup dialog

[Jim Kingdon]

Symptom: if you try to run "xtconq -x" and go through the setup
dialogs, you can't start a game.  It just beeps when you hit "go".

Cause: The indepside, of course.  The beep happens in valid_gamepop.
Just changing

    /* check sides */
    for (i = 0; i < numsides; ++i) {

to

    /* check sides (excluding indepside) */
    for (i = 1; i < numsides; ++i) {

isn't right though; that causes 3 real sides to get created, and much
confusion.

Solution: get xinit.c (which does the xtconq setup dialogs) to
consistently use the indepside machinery right.  It isn't immediately
obvious to me what has to change for this to happen.