cross-compiling ghc to openbsd

[Donn Cave]

Quoth Nicolas Martyanoff <khaelin at gmail.com>,

> It seems that SIZEOF_VOID_P isn't defined anywhere.

I guess it's immaterial if you aren't going to pursue the port
strategy any farther, but from a cursory look, this would happen
at the point where the configuration log says "checking size of void *".
That's failing because of an autoconf error, or a C compiler
configuration issue, I would guess.

	Donn