Fix a test's EOL-style portability problem introduced in r32907, and enabled in r32913, that caused it to fail on Windows.
Fix a test's EOL-style portability problem introduced in r32907, and enabled
in r32913, that caused it to fail on Windows.

Suggested by: pburba

* subversion/tests/cmdline/merge_tests.py
  (merge_an_eol_unification_and_set_svn_eol_style): Write out the initial
    file contents in binary mode to get the exact EOL style combination we
    want.

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