Replace all #!/usr/bin/perl with #!/usr/bin/env perl

As suggested in #9057.

1 files changed, 2 insertions, 1 deletions

diff --git a/sync-all b/sync-all
index e43a6f682e..ffc150ec08 100755
--- a/sync-all
+++ b/sync-all
@@ -1,5 +1,6 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 
+use warnings;
 use strict;
 use Cwd;
 use English;