Show a message box if Qt Creator can't start due to missing dependencies of libxcb.so

With Qt Creator 12 we released binaries for Linux using Qt 6.6.0 which has added a new dependency to libxcb-cursor. See https://bugreports.qt.io/browse/QTBUG-108796

libxcb-cursor is not present on Linux installations by default, and when upgrading to the newer Qt Creator version, the users will have a Qt Creator that does not start.

The error message in Terminal is not useful. See https://forum.qt.io/topic/152528/qtcreator-upgrade-breaks-qtcreator

Qt Creator could do they analysis itself on lib/Qt/plugins/platforms/libqxcb.so and present a graphical messagebox with the information, so the user will know what to do.

See How to show a GUI message box from a bash script in linux? - Stack Overflow for details how to show a message box from a "console" application.

For reading the shared libraries dependencies we have linux - How can I find the dynamic libraries required by an ELF Binary in C++? - Stack Overflow

Since we do use the elfutils library we already have the bits needed to do the analysis.