Log Message:
jbig2dec: Update graphics/jbig2dec to 0.15

pkgsrc changes:
 - Update MASTER_SITES according HOMEPAGE links
 - Add auto* tools to USE_TOOLS and add a pre-configure target in order to
   generate the configure script
 - Add support for the tests

Changes:
Version 0.15 (2018 September 04)
* Bug fix release, with many security related and stability fixes
  as well as better tolerance/behaviour with out of spec files