tools: use standard interpreter path in all Perl scripts

Signed-off-by: David Ward <david.ward@ll.mit.edu>
[changed /usr/bin/perl to /usr/bin/env perl]
Signed-off-by: David Lamparter <equinox@diac24.net>
diff --git a/tools/zc.pl b/tools/zc.pl
index 026e8fe..5307fa3 100755
--- a/tools/zc.pl
+++ b/tools/zc.pl
@@ -1,4 +1,4 @@
-#! /usr/bin/perl
+#!/usr/bin/env perl
 ##
 ## Zebra interactive console
 ## Copyright (C) 2000 Vladimir B. Grebenschikov <vova@express.ru>