wok-next log libpng12/receipt

age author description
2017-06-08 Pascal Bellard libpng1*-dev: update deps
2017-05-27 Aleksej Bobylev Update some more receipts to v2: coreutils, attr, libpng16 (former libpng), libpng12, libwebp, libxml2.
2017-02-15 Aleksej Bobylev Add libpng12; up libpng & apng tools.