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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<tr><td><span title='2020-03-22 16:49:47 +0100'>2020-03-22</span></td><td><a href='/guix/commit/build-aux/hydra/evaluate.scm?id=9acacb71c958218fd69cf0fb9df0b439a980a0f2'>Remove workaround for 'time-monotonic' in Guile 2.2.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to e688c2df3924423b67892cc9939ca099c729d1cb.

* build-aux/hydra/evaluate.scm &lt;top level&gt;: Remove 'time-monotonic'
definition.
* guix/cache.scm: Likewise.
* guix/progress.scm: Likewise.
* guix/scripts/substitute.scm: Likewise.
* guix/scripts/weather.scm: Likewise.
* tests/cache.scm: Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-22 12:42:52 +0100'>2020-03-22</span></td><td><a href='/guix/commit/build-aux/hydra/evaluate.scm?id=66a198c8075f02d7075a555b48dd3adde88ebbbf'>hydra: evaluate: Use 'with-build-handler'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/hydra/evaluate.scm (command-line): Remove 'set!' for
'build-things'.  Use 'with-build-handler' instead.
* build-aux/hydra/gnu-system.scm (hydra-jobs): Add comment about
removing 'show-what-to-build' call.
</span></span></td><td>Ludovic Courtès</td></tr>