[prestest] Message about path not found (windows)

[Uwe Siart]

Karl Berry <karl at freefriends.org> writes:

>       && (wndws() || TeXLive::TLUtils::system_ok("$lmtx --version"))
>
> Ok, installed. -k

Today, this message was gone and

   mtxrun --generate
   context --luatex --generate

were executed again.

-- 
Uwe