PING [4.1 regression, patch] build i686-pc-mingw32

[DJ Delorie]

> Except that "cp" is already used as a fallback for when "ln" doesn't
> work.  If the tool is likely not to work after a "cp" then shouldn't the
> fallback condition be to always create a shell script (or .bat file)?

One could argue that, in the case with ln/cp, we *know* we're dealing
with GNU tools which don't care where they are, but in the case with a
system (i.e. third party) tool, we don't know, hence the script.

There's also the complexity of locating a utility in $PATH, which may
even change between configure and make.

IMHO for MinGW, we (1) know that we're using GNU tools, and (2)
realize we have an exceptional situation wrt the build system.  I
think this justifies an exception test in that snippet of code.