Mac devtool support pruning

[Hans Ronne]

>The Xconq Mac interface has accreted support for a variety of
>development environments and header generations, going all the
>way back to Think C. However, I think that only CodeWarrior and
>PB are actually in use to build it these days, so unless somebody
>has a need, I'll prune out the tangle of bits for the others.

Excellent idea. These headers really need to be cleaned up.

Hans