Vendored libyajl

I've recently been trying to make the rails package reproducible and while staring at diffoscope output I noticed libyajl.so.

I checked the current Arch package gitlab-18.0.2-1-x86_64.pkg.tar.zst and found that it too ships usr/share/webapps/gitlab/vendor/bundle/ruby/3.4.0/gems/libyajl2-2.1.0/lib/libyajl2/vendored-libyajl2/lib/libyajl.so and since it is the only gem with a lib subdirectory and the work in the PKGBUILD to link against system libraries, I think this might be an oversight and wanted to make you aware of it.