Bug#995804: Acknowledgement (libencode-perl: Encode <3.12 leaks)

[Eric Wong]

Note: Encode 3.15 has more comprehensive leak fix
(it leaks on encoding, too, not just decoding).

Avoid 3.14, it segfaults and made 3.15 necessary.

cf. http://nntp.perl.org/group/perl.perl5.porters/261689
   <9FB18B82-1FA8-4E33-B7F2-507E9B35C1B9 at dan.co.jp>

Thanks.