[ 07:46:43 ale ] seamonkeywww The open source, standards compliant web browser
thunderbirdmail Mozilla Thunderbird is standalone mail and news that stands above
Add amd64 as recognized platform.
As secondary consequence, enigmail will correctly build on amd64.
Approved by: silence on gecko@ and gnome@
Tested by: Paul Dokas <email@example.com>,
Lapo Luchini <firstname.lastname@example.org>