This is generally true but specifically false. The builds described in the gist are still linking onigurama dynamically. It is in another package, libonig5, that would be updated normally.
The gist uses the orig tarball only, so skips the distro patch that selects the distro packaged libonig in favor of the "vendored" one. At least that's how it appears to me. I only skimmed the situation.
Or do you see something deeper that ensures that the distro libonig is actually the one that gets used?
