Fedora 40: Transition to Zlib-ng as compatible replacement for Zlib

I believe I meant to link https://fedoraproject.org/wiki/Changes/ZlibNGTransition instead

isn't that full of gcc specific intrinsics? Namely, it excludes de-facto alternative compilers like tcc, cproc/qbe, simple-cc/qbe, etc? (and clang until it catches up)