Fix clock.tick throwing away scheduled functions in case where clock missed the schedule by _exactly_ the interval (pathalogical, but this computer seems very good at it!).
Fix clock.tick throwing away scheduled functions in case where clock missed
the schedule by _exactly_ the interval (pathalogical, but this computer seems
very good at it!).

seeminglee/pyglet64,niklaskorz/pyglet,seeminglee/pyglet64,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet,seeminglee/pyglet64,niklaskorz/pyglet,adamlwgriffiths/Pyglet