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.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion