mckaygerhard be06a8ad6b Disable shaders GUI on unsupported drivers
* address [#7563](https://github.com/minetest/minetest/issues/7563)
* Disable shaders GUI on unsupported drivers
  [#2060](https://github.com/minetest/minetest/issues/2060)
* Disable shaders if unavailable
* also backported "shaders disabled by default"
   continue of commit 21b1462b58
2023-01-05 09:29:24 -04:00
..
2016-04-08 02:25:04 -04:00