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

[Timur Iskhodzhanov]

Alexey,
Of course we do use MSVC link.exe to link ASan tests.
LLD is not ready for ASan on Windows as it doesn't produce debug info.


================
Comment at: test/lit.common.cfg:64
@@ -63,2 +63,3 @@
 # Help MSVS link.exe find the standard libraries.
-if platform.system() == 'Windows':
+# Make sure we only try to use it when targetting Windows
+if platform.system() == 'Windows' and config.target_triple.endswith('win32'):
----------------
I don't understand the comment and how it is related to the change in the code.

You've probably meant to write the condition meaning `"if MSVC:"` ?
If so, I don't think you need an extra comment:
```
  # On Windows, help MSVS link.exe find the standard libraries.
  if platform.system() == 'Windows' and ...:
```

Deferring the condition to Reid and Hans who know the triples better.

http://reviews.llvm.org/D7739

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