Bug#828933: Improve check to determine if the package installs a new interpreter

[Jakub Wilk <jwilk@debian.org>]

Control: tags -1 + pending

* Sergio Durigan Junior <sergiodj@sergiodj.net>, 2016-06-29, 01:18:
> the current check to see if there is a new interpreter being installed 
> is incomplete, because it assumes that the executable file will be in 
> the toplevel directory.

Not quite. The code worked in the usual case when full interpreter path 
was specified, i.e. "#!/usr/bin/foo", but not for "#!/usr/bin/env foo".

I've committed a different fix for the latter case.

Thanks for the bug report.

--
Jakub Wilk