[wip][patch] use qmake with autoconf for qt5 too

[Enrico Forestieri]

On Fri, Jun 14, 2024 at 08:09:00PM +0200, Jean-Marc Lasgouttes wrote:
> 
>Could you people have a go at it before I push it?

I tried it with native Windows and Cygwin with GDI backend instead of X11.

In both cases it detected the winextras module and added appropriate 
includes and libraries. However, while in the native case I could paste 
graphics in EMF format, I was not able to do it in the Cygwin case.

After investigating, it turned out that the previous method was taking 
into account the DEFINES and PRL_EXPORT_DEFINES variables present in the 
platform's qmake.conf file, in the mkspecs directory, while the qmake 
method does not.

After moving those definitions into CPPFLAGS and passing them to 
configure, the Cygwin build also worked fine.

I wonder if this change might somehow compromise other configurations as 
well. You know, if it works... ;)

-- 
Enrico