[lit] Run the ShUtil tests as part of the test suite.

llvm-svn: 174018
diff --git a/llvm/utils/lit/tests/lit.cfg b/llvm/utils/lit/tests/lit.cfg
index b32c354f..32760ce 100644
--- a/llvm/utils/lit/tests/lit.cfg
+++ b/llvm/utils/lit/tests/lit.cfg
@@ -23,6 +23,7 @@
 config.target_triple = None
 
 src_root = os.path.join(config.test_source_root, '..')
+config.environment['PYTHONPATH'] = src_root
 config.substitutions.append(('%{src_root}', src_root))
 config.substitutions.append(('%{inputs}', os.path.join(
             src_root, 'tests', 'Inputs')))