archlinux/devtools!109 (comment 74475)

Note that the deprecated isync compatibility wrapper has been removed in this
release, migrate your ~/.isyncrc to ~/.mbsyncrc and use mbsync directly
instead to upgrade.

introduced in version 1.3.2, meaning affected mailboxes will redownload
messages in order to fix the directory structure.

FTR, commands used to change arch=() and then verify the changes:

$ sed -Ei "/^arch=/{s/ *?['\"]?i686['\"]? *?//;s/ *$//}" */*/PKGBUILD*

$ grep -r i686 * | grep arch= | grep -v repos

$ svn diff | grep -A 1 ^-[^-] | grep -v -- -- | cut -c2- |
  while IFS=$'\n' read -r l1; IFS=$'\n' read -r l2; do
    echo "$l1 -> $l2"
  done | sort -u