Making the test test_taint_crossing_substr_and_concatenation genuine.

Author: marek-trtik

regression/end_to_end/tainted-string-type-concat/test_tainted_string_type_concat.py

@@ -1,11 +1,9 @@
 import regression.end_to_end.driver as pipeline_executor
 import os.path
-import pytest
 import subprocess
 import regression.utils as utils
 
 
-@pytest.mark.xfail
 def test_taint_crossing_substr_and_concatenation():
     with utils.working_dir(os.path.abspath(os.path.dirname(__file__))):
         subprocess.call("ant")