Update to latest revision. More/better/faster. Shared library name change
in this one.
Bump PKGREVISION due to shared library name change in SDL2.
Updated to latest version. From ChangeLog:
- Now depends on :mod:`billiard` 2.7.3.31.
    This version fixed a bug when running without the billiard C extension.
Updated to latest version. Patches applied upstream. Removing.