Compile fails when no ssl configured in QT

[Jawad Mokhtar]

The library fails to compile when ssl in not configured in QT. See attached compile results.

[Matt Broadstone]

I will gladly accept pull requests to fix this issue, but unfortunately have very little time these days to maintain qjsonrpc.

[Jawad Mokhtar]

I'm also have very little time. I'll try to get you a pull request in the next few weeks. Thanks.