[pass] Use find instead of tree to search for cmd_find

[Allan Odgaard]

On 23 Sep 2014, at 12:22, Hugo Osvaldo Barrera wrote:

> That slipped my mind, I agree, though a minor nitpick (from `man 
> find`):
> […]
> So I'd stick to -iwholename rather than ipath.

 From `man find` on a BSD system:

      -ipath pattern
              Like -path, but the match is case insensitive.
      ⋮
      -iwholename pattern
              The same thing as -ipath, for GNU find compatibility.

I wonder why GNU would deprecate -ipath (since it’s shorter)? Anyway, 
should be safe to use -iwholename on both BSD and GNU systems.