[Patch] lit.cfg: better check for MSYS

[Hans Wennborg]

Hi,

The attached patch tightens the "shell-preserves-root" feature check
in lit.cfg. Previously, the check would exclude this feature also on
Cygwin, but as the comment suggests, I think it should only check for
MSYS.

With this patch, the number of unsupported tests on Cygwin go from 35 to 32.

I was not able to test this on MSYS. Takumi, could you give it a try?

Thanks,
Hans
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