Look for irony-server in irony.el directory

[matthewbauer]

This makes irony--find-server-executable look in
/server/bin for the irony-server executable. This is
useful when you want the irony-server executable to be preinstalled
system-wide in your Emacs setup. This saves users the trouble of
having to individually build irony-server and have all of the
dependencies that come with it.

[Sarcasm]

Do you have a package manager in mind that does this, or some other Emacs module?

For a system package manager, I would expect irony-server to end up in the user PATH eventually, which I think already works.
I'm not sure how and where Elpa packages are supposed to install binaries or Emacs modules, but I don't really want to invent multiple conventions of my own.

[matthewbauer]

Yeah, just putting it in PATH makes sense. ELPA doesn't really have a way to handle executables though, so it's a little bit weird. In Nixpkgs, we just put everything into /share/emacs/site-lisp/elpa/<pkg>. But I think it can be changed to put it in /bin instead.