ra_serf: Remove abort's.
ra_serf: Remove abort's.

* subversion/libsvn_ra_serf/auth.c
  (global): include svn_private_config.h for _() declaration.
  (handle_basic_auth): replace abort's with error messages.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@869657 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion