[llvm] [lit][bazel] Fall back to a default PATHEXT when the variable is unset (PR #217416)

[via llvm-commits]

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@@ -43,10 +44,9 @@ def usable_core_count():
 
     return n
 
-def abs_path_preserve_drive(path):
-    """Return the absolute path without resolving drive mappings on Windows.
 
-    """
+def abs_path_preserve_drive(path):
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UebelAndre wrote:

Sorry! My IDE must have added some stuff on the last commit. Removed!

https://github.com/llvm/llvm-project/pull/217416