Follow-up to r1081491: Fix broken --log-to-stdout with C tests.
Follow-up to r1081491: Fix broken --log-to-stdout with C tests.

* build/run_tests.py
  (TestHarness._run_c_test): There is no log when using
   --log-to-stdout, so don't try to write to it.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion