Fix filtering on non-UTF8 changelist names.  We store changelists in
UTF8 in the working copy, but were failing to convert the value of the
--changelist option to UTF8 for comparison against those stored names.

* subversion/svn/svn.c
  (main): Convert --changelist option values (changelist names) to UTF8.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1475724 13f79535-47bb-0310-9956-ffa450edef68