Bug#845020: override: larch:mail/optional

[Martín Ferrari]

Package: ftp.debian.org
Severity: normal
Control: block 832228 -1

As correctly pointed out in
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=832228 the current section
for larch is incorrect: it is "ruby", should be "mail".

Thanks.