On the fsfs-format7 branch: Rev the svn_io_file_create API to allow
for binary strings as well.

* subversion/include/svn_io.h
  (svn_io_file_create2): rev'ed API
  (svn_io_file_create): deprecate
* subversion/libsvn_subr/io.c
  (svn_io_file_create2): implement
  (svn_io_file_create): implement in terms of the new API


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1433848 13f79535-47bb-0310-9956-ffa450edef68