Based on the work on GLES support of @kvark, only two pieces were
missing for usable GLES support:
- https://github.com/kvark/blade/pull/125 was upstreamed 2 weeks ago and
is contained in the currently referenced zed-industries/blade fork
- https://github.com/kvark/blade/pull/126 was upstreamed 17 hours ago
and is not contained in the zed-industries fork. As the zed-industries
fork was also upstreamed in https://github.com/kvark/blade/pull/128, we
can switch back to mainline blade.

If you don't want to switch back to mainline blade, please integrate
https://github.com/kvark/blade/pull/126 to your fork.

Release Notes:

- Fix GLES backend (#9581)