In svnlook and svn, pass the right error code as apr error when fputs fails.

* subversion/svn/util.c
  (svn_cl__error_checked_fputs):
* subversion/svnlook/svnlook.c
  (do_plist): Wrap errno in the way apr expects it, to allow translating back
    to an error message.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1630369 13f79535-47bb-0310-9956-ffa450edef68