bug#23451: 25.0.93; Clarify the dependency on find/grep for platforms not having those tools

[Dmitry Gutov]

On 5/29/17 8:35 PM, Eli Zaretskii wrote:

> I think we should simply test explicitly for 'find' and 'grep' being
> available, before we run the command.

Windows comes with find.exe, though, one we can't use.

> Otherwise, it sounds like we
> will increase the complexity and the fragility of the feature, to very
> little gain.

Agreed, I was hoping for a solution that would more or less fit one of 
the templates defined in grep.el.

See commit 4886b2e for something entirely different.