Handle LD_LIBRARY_PATH not being defined.
Should fix the bots after r225890. llvm-svn: 225919
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			@ -19,7 +19,7 @@ def push_dynamic_library_lookup_path(config, new_path):
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    dynamic_library_lookup_var = 'LD_LIBRARY_PATH'
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  new_ld_library_path = os.path.pathsep.join(
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    (new_path, config.environment[dynamic_library_lookup_var]))
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    (new_path, config.environment.get(dynamic_library_lookup_var, '')))
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  config.environment[dynamic_library_lookup_var] = new_ld_library_path
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# Setup config name.
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