llvm: remove pic variant; always enable pic

[ryandesign@…]

The llvm 2.6 port has a pic variant to enable position-indepentent code. Without that variant, pic is disabled.

I think in the llvm 2.5 port, pic was always enabled, regardless whether you used the pic variant or not.

pure does not compile unless llvm has pic support.

Is there a reason not to just enable pic all the time in llvm? On Mac OS X, pic is enabled by default for all programs.

[erickt@…]

I'll add that back. Someone requested it for pure, but if it's not working with it, I'll disable it.

[ryandesign@…]

r60502.