Add eglstream-kms

[AlanGriffiths]

For testing with Nvidia

[xnox]

I guess this is also in some ways a duplicate of #44 cause that one would also cause the eglstream platform to be available.

[AlanGriffiths]

@xnox we're not going to land this given the current state of Nvidia support on Core.

But there is a corresponding release in the store: edge/pr43.

[xnox]

@xnox we're not going to land this given the current state of Nvidia support on Core.

But there is a corresponding release in the store: edge/pr43.

surely it is mostly harmless to land this ;-)

[AlanGriffiths]

surely it is mostly harmless to land this ;-)

You know some folks don't need much reason to think something works before they complain that it doesn't.

[Saviq]

This got added through #117