ci/fedora-release: Upgrade to F38, enable rusticl
Plus misc fixes to avoid new warnings with GCC 13 / LLVM 16.
Still need to add -Wno-error=dangling-reference -Wno-error=overloaded-virtual
for C++ for now. On the bright side, we can drop -Wno-error=array-bounds
.
Edited by Michel Dänzer