mod_ssl adjustments to help with using toolkits other than OpenSSL:

  Use SSL functions/macros instead of directly dereferencing SSL
  structures wherever possible.
  Add type-casts for the cases where functions return a generic pointer.
  Add $SSL/include to configure search path.
PR:
Obtained from:
Submitted by:	Madhusudan Mathihalli <madhusudan_mathihalli@hp.com>
Reviewed by:	dougm


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@92800 13f79535-47bb-0310-9956-ffa450edef68