Fix utf8_tests.py on systems which support os.putenv() *and* have the en_US.ISO8859-1 locale installed.
Fix utf8_tests.py on systems which support os.putenv() *and* have the
en_US.ISO8859-1 locale installed.

* subversion/tests/clients/cmdline/utf8_tests.py
  (): Set our locale in the environment to pass it to the svn binaries.

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