[lit] Ship and bundle license for lit package

[serge-sans-paille]

Summary

lit is bundled independently from LLVM in at least one location

(https://pypi.org/project/lit/), it's easier to state its license locally.

[tstellar]

LGTM.

llvm/utils/lit/LICENSE.TXT

+==============================================================================
+The LLVM Project is under the Apache License v2.0 with LLVM Exceptions:
+==============================================================================
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+

llvm/utils/lit/setup.py

 setup(
     name = "lit",
     version = lit.__version__,
 
     author = lit.__author__,
     author_email = lit.__email__,
     url = 'http://llvm.org',
     license = 'Apache-2.0 with LLVM exception',
+    license_files = ['LICENSE.TXT'],
 
     description = "A Software Testing Tool",
     keywords = 'test C++ automatic discovery',
     long_description = """\
 *lit*
 +++++
 
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