Qt::WindowFlags f = nullptr in framworks headers

[Stephen Kelly]

Hello,

As a result of the recent porting from 0 to nullptr, we have things like 

 Qt::WindowFlags f = nullptr

in frameworks headers. See for example kruler. That is - enum default 
parameter values have been ported incorrectly.

I don't know if some clang tooling is being used to do the porting, but if 
so, the tool is buggy.

Attempting to build the python bindings now fails because our scripting to 
generate sip files (or sip itself - I didn't investigate further because it 
seems obvious that the headers should be fixed to solve the issue) can not 
handle this.

Thanks,

Steve.