git: 'stash' is not a git command

Firstly, many thanks for Dugite Native. All in all, it's excellent.

I've come across a problem on the Ubuntu builds, with versions 2.21, 2.19.2 and 2.16. With them, the error `git: 'stash' is not a git command` is given. On inspecting the `/libexec/git-core` folder, this is because whilst the other Git commands like `git-add` are shortcuts to the `git` executable in the same folder, `git-stash` is a small script, albeit with Stash commands like `pop` and `drop` within it. Some other Git commands are similar, although most are shortcuts. I note that this problem doesn't happen on the Windows versions.

I get the feeling that this might be intentional? Is there a work around?

Thanks in advance, Paul.