Remove an apparently unneeded normcase() call.

I believe this call is unneeded after https://reviews.llvm.org/D34855.

Reviewed as part of https://reviews.llvm.org/D78169

llvm/utils/lit/lit/formats/googletest.py

@@ -12,7 +12,7 @@ kIsWindows = sys.platform in ['win32', 'cygwin']
 
 class GoogleTest(TestFormat):
     def __init__(self, test_sub_dirs, test_suffix):
-        self.test_sub_dirs = os.path.normcase(str(test_sub_dirs)).split(';')
+        self.test_sub_dirs = str(test_sub_dirs).split(';')
 
         # On Windows, assume tests will also end in '.exe'.
         exe_suffix = str(test_suffix)