cli.t: test with the right Perl executable

t/cli.t calls scripts which run with the first perl found in the
user's PATH (usually the system perl), not with the perl used for the
build, as reported here:

    https://rt.cpan.org/Ticket/Display.html?id=129944

Thanks to Slaven Rezic for spotting this and reporting it!

THANKS

@@ -36,6 +36,7 @@ Jean Louis
 Daniel Shahaf
 Matan Nassau
 Brice Waegeneire
+Slaven Rezic
 
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