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-b7f2-507e9b35c...@dan.co.jp>

Thanks.