If LD_LIBRARY_PATH is set in the system environment, use it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97796 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/lit/TestingConfig.py

@@ -10,6 +10,7 @@ class TestingConfig:
         if config is None:
             # Set the environment based on the command line arguments.
             environment = {
+                'LD_LIBRARY_PATH' : os.environ.get('LD_LIBRARY_PATH',''),
                 'PATH' : os.pathsep.join(litConfig.path +
                                          [os.environ.get('PATH','')]),
                 'PATHEXT' : os.environ.get('PATHEXT',''),