* subversion/svn/auth-cmd.c: Disable pretty-printing on SSL certs on Windows,
   because it is broken with all currently released versions of serf.
   To make it easier to enable/disable this feature, add a new
   SVN_AUTH_PRETTY_PRINT_SSL_CERTS define switch instead of directly
   using SVN_HAVE_SERF for this purpose.

Found by: rhuijben


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1572548 13f79535-47bb-0310-9956-ffa450edef68