mod_ssl: when compiled against OpenSSL 1.0.1 or later, allow explicit

control of TLSv1.1 and TLSv1.2 through the SSLProtocol directive,
adding TLSv1.1 and TLSv1.2 support by default given 'SSLProtocol All'.

Picked up comment edit, trusting openssl compilation state and current
method which openssl uses to include opensslconf.h - if this should be
refined, it needs to be refined for other openssl operations as well.
Any #define OPENSSL_* for httpd alone would be invalid, these are all
namespace protected by openssl.org project.

Submitted by: kbrand, wrowe
Backports: 1222921, 1222930, 1225476, 1225792
Reviewed by: sf, kbrand, rjung



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1375076 13f79535-47bb-0310-9956-ffa450edef68