Test export of externals (directory/file) with `--native-eol' option which was having a *bug* and got fixed in r966747 and r981757.
Test export of externals (directory/file) with `--native-eol' option which
was having a *bug* and got fixed in r966747 and r981757.

* subversion/tests/cmdline/export_tests.py
  (export_externals_with_native_eol): New test case.
  (test_list): Add the above test.

Patch by: Vijayaguru G <vijay@collab.net>

Tweaked by me (formatting only).

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