Avoiding llvm from ports on rpi4

Hello,

Building llvm19 as a dependency just for mesa-dri is something
that I like to tweak to avoid waiting >15 hours building it.

pkg info -r llvm19
llvm19-19.1.7_1:
        mesa-dri-24.1.7_4

There is a PR about it, but I don't know the best way to hack it:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238906

Any help is welcome!

Thanks,

-- 
Nuno Teixeira
FreeBSD UNIX:  <eduardo@FreeBSD.org>   Web:  https://FreeBSD.org