[SQUASH] imapclient: disable workaround for Mail::IMAPClient 3.43+

[Eric Wong]

Will squash this in to disable the 'once' warning

diff --git a/lib/PublicInbox/IMAPClient.pm b/lib/PublicInbox/IMAPClient.pm
index 945b10fa..56001517 100644
--- a/lib/PublicInbox/IMAPClient.pm
+++ b/lib/PublicInbox/IMAPClient.pm
@@ -13,6 +13,7 @@ use strict;
 use parent 'Mail::IMAPClient';
 unless (eval('use Mail::IMAPClient 3.43')) {
 require Errno;
+no warnings 'once';
 
 # RFC4978 COMPRESS
 *compress = sub {

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