Behind the scenery

Just like the original binpatch 

we work with an extracted OpenBSD install as well as extracted src

Source is patched, rebuild according to the rules in the Makefile

We iterate over the result, finding changed files

Instead of simply tar'ing the result, we create a proper OpenBSD pkg

Since pkg_create(1) has various sanity checks for file modes, I added some perl magic to hack-up the generated plist