libass-0.12.3

[Fernando de Oliveira]

​https://github.com/libass/libass/releases/download/0.12.3/libass-0.12.3.tar.xz

​https://github.com/libass/libass/blob/master/Changelog

libass (0.12.3)
 * VSFilter blur compatibility changes
 * VSFilter color/alpha parsing compatibility changes
 * Bugfixes
   * Fix some potential memory leaks and crashes
   * Fix large timestamps (larger than about 600 hours)
   * Fix a potential crash with the new rasterizer and complex fonts
   * Do not apply user-configured line position to non-dialog events
   * Strictly clip non-dialog events to the video rectangle

[bdubbs@…]

Fixed at revision 16211.

Upstream did not make a properly named distribution tarball, so I had to copy it to anduin with the proper name. This is a github problem when accessing vai wget. Now needs 'sh autogen.sh'.