docs: mark ARB_compute_shader as done for nvc0
docs: mark ARB_compute_shader as done for nvc0

This has been merged few months ago but this should help
https://mesamatrix.net/ to update its list of supported extensions.

Please note that compute shaders are not really useful without
ARB_image_load_store and only GK104 and GK110 support it for now.

Signed-off-by: Samuel Pitoiset <506e97eed81d9e59d22f4c73fb51123bb62b4a30@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler