[features.txt] Flag optional extensions?
Hi!
Someone pointed out on the mesamatrix.net repo that some OpenCL extensions are written as optional but prevent from marking the drivers as 100% done, such as the Optional image formats extension for OpenCL 1.1.
Here's the original issue: https://github.com/MightyCreak/mesamatrix/issues/200
Do you think this is something that should be addressed?