[PATCH] Don't set $LIB if we're not targetting windows.

[Timur Iskhodzhanov]

>
> The comment came with my private code. But I don't feel strongly about it.


I see.


> The thing is: we might be running on Windows, but targeting a different
> OS. In which case we don't want to pass LIB along. Your toolchain runs on
> Windows, but you're compiling for arch-vendor-anotheros.
>

I'm not sure how cross-compilation of tests works in LLVM.
Do we ever invoke LIT for anything that we can't run on the current system?


> Wouldn't lld on Windows also look at LIB if it was emulating link.exe (I
> don't know if there's a mode for that, like for emulating ld)?
>

Good point, I'm pretty sure LLD would need LIB to be set too.
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