Add import and tweak build parameters

[dlemos]

I Followed the instructions to build https://github.com/rochus-keller/Cedar but I needed to change a few things in LeanQT to get it building on Ubuntu 24.10 using GCC 14.1.0

I'm not sure if any of this changes are really necessary, but if I don't change the C standard to gnu, stdio.h won't define asprintf in one place and vasprintf on another. And without the include I get errors that uintptr_t is undefined.

Unrelated suggestion: You should strongly advise on the README of project using LeanQT that people consider using LeanCreator, instead of using BUSY (directly?) to get the benefits of compiling in parallel.

[rochus-keller]

Thanks for the feedback. I will try to run a build on a recent Debian system and see if it works. Actually I would rather change the xcb/xkb code that is meets the C99 standard than depending on a proprietary GCC dialect. I will look at the source whether I can get rid of vasprintf/asprintf and replace it by a standard solution. So far there was no problem with it on all systems I tried. In atoms.c they did it right; will do the same thing in context.c.

[rochus-keller]

I just pushed a new commit with a fix, rplacing asprintf by sprintf, if you want to try it.