Fix building on Ubuntu 22.10

[JorisGoosen]

With this version of the code I can build & run it on both Ubuntu and macOs

[eddelbuettel]

Will test in a bit!

[eddelbuettel]

No luck yet (when working off your branch)

edd@rob:/tmp/rcpp/rinside/rinside/inst/examples/qt/build(master)$ cmake -S ../cmake/ -G "Unix Makefiles"
CMake Error at /usr/share/cmake-3.24/Modules/FindQt4.cmake:1314 (message):
  Found unsuitable Qt version "" from NOTFOUND, this code requires Qt 4.x
Call Stack (most recent call first):
  CMakeLists.txt:5 (find_package)


-- Configuring incomplete, errors occurred!
See also "/tmp/rcpp/rinside/rinside/inst/examples/qt/build/CMakeFiles/CMakeOutput.log".
edd@rob:/tmp/rcpp/rinside/rinside/inst/examples/qt/build(master)$ 

[JorisGoosen]

The errormessage sounds rather like you are using an older version of the code as it looks for Qt4 instead of Qt6.
Also in your copy-paste:

edd@rob:/tmp/rcpp/rinside/rinside/inst/examples/qt/build(master)$

Perhaps the old local master is checked out?

[eddelbuettel]

Doh. Quite possibly. Was in a rush. So sorry!

Works perfectly fine (modulo too much compiler noise from Rcpp, whoops) when I am on the correct branch.

[eddelbuettel]

To make up for the whoops I allowed myself a rebase and push back to you -- this PR is now cleanly one commit ahead of master.

[JorisGoosen]

Thanks for the test and Ill get back to you once I feel up to fighting with Windows again, as I do need to use RInside with Qt there anyway...

[eddelbuettel]

As maintainer, I am quite happy to not insist on Windows. I once or twice ages went through all the hoops to demonstrate it works but Linux and macOS are simply much more important.

So to me the only TODO (on my end) is to add you to ChangeLog and NEWS for the two quick PRs. Thanks again for both!