Following up on r1534976, use WCHAR where we used apr_wchar_t from a private
apr header before.

* subversion/libsvn_subr/io.c
  (GETFINALPATHNAMEBYHANDLE): Update argument type.
  (io_unicode_to_utf8_path): Update argument type.
  (io_win_read_link): Update variable type.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1534978 13f79535-47bb-0310-9956-ffa450edef68