Fix up SSL autoconf-fu so as not to emit bogus lines.

* acinclude.m4
  (APACHE_CHECK_SSL_TOOLKIT): Move CHECKING line to match; convert a warning
  to AC_MSG_WARN; remove a spurious SSL-C checking; redirect stderr from the
  pkgconfig so as not to spew on errors.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@730914 13f79535-47bb-0310-9956-ffa450edef68