Qt5 fixes

[m-kuhn]

Patches the new auth system to compile against Qt5 (See commit message for more information)

Fixes some additional warnings when compiling for Qt5.

[nirvn]

@m-kuhn, @dakcarto , that fixes compilation errors, excellent.

[dakcarto]

@m-kuhn

These changes look fine to me. I have not tested the auth system code against Qt5 (obviously). I think there may be several other places that need some work, relative to changes through Qt 5.5:

• enum QSsl::KeyAlgorithm - Elliptic Curve algorithms are new, though unclear to me how prevalent their use is in client PKI bundles, which is the only private key support in the auth system
• enum QSsl::SslProtocol - Introduces changes to enums, but looks to be compatible with SSL server configuration still

+1 to merge

[m-kuhn]

@dakcarto thanks for the review. I did not check the auth code either, at the moment I'm happy as long as we get the code through the compiler and linker with Qt5 to get a gradually increasing amount of testers and improved codebase.

One thing that came to my mind though, with Qt4 there was always only one subject info and issuer info. With Qt5 there could be multiple. Now we replicate the Qt4 behavior to always check the first one. But I could imagine that it would be good to use the whole list with Qt5 (they probably changed it to a list for a reason). But I am not sure if in this case it needs to match all or any and if this is even something that should be considered important.

[m-kuhn]

Merged in dc04314