llvm/test/Other/close-stderr.ll: Remove "XFAIL:win32". It reverts r173509.

"REQUIRES: shell" should cover if this failed.
llvm/test/lit.cfg: Tighten conditions to enable 'native'.

I saw the case that 'native' was mis-enabled when x86_64-pc-win32 on x86_64-linux.

FIXME: Consider cases that target can be executed even if host_triple were different from target_triple.