Revert a change that snuck into r35425.
Revert a change that snuck into r35425.

* subversion/libsvn_ra_serf/util.c:
  (ssl_server_cert): restore functionality

Found by: arfrever


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@875502 13f79535-47bb-0310-9956-ffa450edef68

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