[Development] Suggestion: switch binary builds to OpenSSL 1.1 in Qt 5.11

[Thiago Macieira]

As $SUBJECT says.

Only for 5.11 onward, so shouldn't affect the 5.6 and 5.9 LTS (which don't 
have OpenSSL 1.1 support anyway) or any 5.10.x releases still to come.

As a bonus side-effect, users who hadn't realised they have an old, not-up-to-
date OpenSSL will have to fix the issue.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center