bug#20330: Do not capture build-time $PATH in 'emacs' binary

[Eli Zaretskii]

> From: ludo@gnu.org (Ludovic Courtès)
> Cc: 20330@debbugs.gnu.org
> Date: Wed, 15 Apr 2015 18:37:00 +0200
> 
> >> > What makes PATH special?  Don't you want to prevent any build-time
> >> > directories (except source-directory) from leaking into the binary?
> >> 
> >> I do, but I haven’t noticed any other leaks.  Do you think there are
> >> others?
> >
> > load-path comes to mind, it can include PATH_DUMPLOADSEARCH, AFAIR.
> 
> Maybe you’re right, but I haven’t noticed any such thing with Guix’s
> conservative GC scanner.

I clearly see it in my build of Emacs.  Try grepping through output of
"strings ./emacs".