[interchange] Cleanup warnings

[David Christensen]

commit 8336e994572b404bca79065c829d9a6f58e91a9b
Author: David Christensen <david at endpoint.com>
Date:   Thu Jun 22 15:02:29 2017 -0500

    Cleanup warnings

 scripts/interchange.PL |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/scripts/interchange.PL b/scripts/interchange.PL
index 21b0376..e674fbf 100644
--- a/scripts/interchange.PL
+++ b/scripts/interchange.PL
@@ -152,6 +152,7 @@ BEGIN {
 
 use vars qw($VERSION);
 require Exporter;
+no warnings qw/once/;
 
 BEGIN {
 	$VERSION = '5.10.0';