Patch borrowed from nixpkgs.  Works around warning message produced by the
current version of Moose:

"Passing a list of values to enum is deprecated. Enum values should be wrapped
in an arrayref."

--- Net-Amazon-S3-0.60/lib/Net/Amazon/S3/Client/Object.pm	2015-04-15 16:18:47.226410022 -0500
+++ Net-Amazon-S3-0.60/lib/Net/Amazon/S3/Client/Object.pm	2015-04-15 16:19:25.410408425 -0500
@@ -19,7 +19,7 @@
     [ qw(private public-read public-read-write authenticated-read) ];
 
 enum 'StorageClass' =>
-    qw(standard reduced_redundancy);
+    [ qw(standard reduced_redundancy) ];
 
 has 'client' =>
     ( is => 'ro', isa => 'Net::Amazon::S3::Client', required => 1 );
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