[popcornmix]

1)if there is an eta on when this is going to be merged back / available in this builds?

We are waiting for the necessary agile commits to be submitted to the kodi tree. We'll likely start including them in these builds at that point.
PR11765 was a pre-requisite for this which has just been merged after a number of weeks.
I would have thought "a few weeks" is most likely (more likely than "a few days" or "a few months"), but it's hard to predict.

2) will this also fix the opengl issues for n64 emulators on the rpis?

No, that is not related. retroplayer doesn't currently support opengl which I imagine is required for n64 emulation.
Might be worth following this thread as that would involve adding
opengl rendering to retroplayer. But I suspect that will be more likely "a few months" away.