Addresses the huge issue that Crypt::PasswdMD5 is probably not, and
  Digest::SHA1 is possibly not already installed, but the user may not
  even need it for their files!  Also inform the user what to grab and
  where.  Finally, assures that the old Crypt::PasswdMD5 (that didn't
  export apache_md5_crypt()) will work nonetheless.

  There is still one -big- problem ... the list of xDBM_Files options
  won't necessarily correspond to how Apache was built, nor if they
  are using mod_auth_db vs. mod_auth_dbm.  This has -got- to be fixed
  (although it's an old problem.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86432 13f79535-47bb-0310-9956-ffa450edef68