Make CRAM implementation build on systems without APR_HAS_RANDOM.
Make CRAM implementation build on systems without APR_HAS_RANDOM.

* libsvn_ra_svn/cram.c
  (make_nonce): Use the current time if we can't make random bytes.
  (svn_ra_svn_cram_server): Use make_nonce.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@847875 13f79535-47bb-0310-9956-ffa450edef68

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