Make OpenSSL pkg-config usage consistent so that we don't run the early

configure checks against a /usr installed OpenSSL and then link against
a different pkg-config installed OpenSSL.

(Hint: Try with Mac OS X with MacPorts's OpenSSL or FreeBSD w/OpenSSL ports.)

* acinclude.m4
  (APACHE_CHECK_SSL_TOOLKIT): Load in pkg-config variables first before doing
  any OpenSSL checks so that we don't clobber things later.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@730926 13f79535-47bb-0310-9956-ffa450edef68