[tlbuild] mtx and libp2c

[Karl Berry]

     >| > m-tx.lua suffice?

I'm confused.
Do users invoke "mtx" now or "prepmx" or "pmx" or some combination thereof?
In any case, the idea is that they will invoke "m-tx.lua" now?

That's surely fine as far as conflicts go, but in my experience it's
suboptimal to embed the implementation language in the command name.
With the -, I don't see a problem with just calling it "m-tx".

Thanks,
k