asunder: update to 2.8.

pkgsrc: add options.mk for optional encoders

Changes:
3 Oct 2015 - 2.8
=================
- Updates to Sweedish, Norwegian, Russian, and Danish translations.
- Fixed a couple of (unlikely) memory corruption bugs and some minor memory leaks.

26 Jan 2015 - 2.7
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- Added an option (enabled by default) to rip much faster.

24 Nov 2014 - 2.6
=================
- Added 64 translations generated by the OSTD ( http://littlesvr.ca/ostd ): Afrikaans, Amharic, Aragonese, Assamese, Azerbaijani, Belarusian, Bengali, Breton, Welsh, Dzongkha, Persian, Fulah, Faroese, Western, Irish, Gujarati, Hindi, Haitian, Armenian, Interlingua, Indonesian, Icelandic, Georgian, Kazakh, Centra, Korean, Kurdish, Kirghiz, Latin, Luxembourgish, Ganda, Lithuanian, Malagasy, Macedonian, Malayalam, Mongolian, Marathi, Malay, Burmese, Nepali, Occitan, Oriya, Panjabi, Pushto, Romanian, Kinyarwanda, Sinhala, Tamil, Telugu, Thai, Turkmen, Tagalog, Tatar, Uighur, Ukrainian, Urdu, Uzbek, Uzbek (Cyrillic), Vietnamese, Walloon, Wolof, Xhosa, Yiddish, and Zulu
- Updated Simplified Chinese, Czeck, Italian, and Norwegean translations.

(triaxx)