If ccache is availble, use it. It can improve a lot the compilation time.
We do not change the meson_cross_file.txt as, for now, meson doesn't
support ccache when cross-compiling.
Fedora provides a set of (powerfull) tools to correctly pass the right
options to compilation tools (configure, cmake, ...)
This is great but we must not use them as we want to cross-compile from
other distribution (ubuntu).
Now, we do not use those tools and we can easily port cross-compilation to
ubuntu.
Matthieu Gautier