multimedia/kodi: Update to 19.0b2
We usually try to avoid updating to beta releases but this time we were
forced by the upcoming python2.7 removal and had to hurry up to get it
into the tree before 31st. Bugs are expected and testing was limited.
Kodi 19.0 will be the first release that supports python3 so we had no
other choice. Sorry!

The maintainer situation for kodi and kodi-devel really needs some
improvement so I'm glad that yzrh did the heavy lifting and stepped up
as the next kodi maintainer. Thanks a lot to him!

PR: 249724
Submitted by: yzrh@tuta.io (per email)