On the 'issue-3148-dev' branch: Remove the addition of a custom error
type that only ever gets passed off to a warning printer that couldn't
care less about the error type.

And, uh, no, this still doesn't pass the test suite.

* subversion/svn/notify.c
  (notify): In the 'svn_wc_notify_failed_external' case, generate the
    generic warning line with a generic error code.  Also, fix the
    warning prefix to include a trailing space.

* subversion/include/svn_error_codes.h
  (SVN_ERR_CL_FAILED_EXTERNALS_CHANGE): Remove as unused.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/issue-3148-dev@875201 13f79535-47bb-0310-9956-ffa450edef68