[bug#49357] [PATCH] gnu darktable update to 3.6.0

[John Kehayias]

Thanks, did not catch those. For LLVM, I don't think Darktable cares about 
version, as this commit just shows they added v12 since it was reported to 
work: 
https://github.com/darktable-org/darktable/commit/4215f9995fdcc308eb9c6769b839ffac83ded5d9

As for OpenEXR, I have not tested it nor used that feature in the past. I just 
tried and "darktable --version" does show OpenEXR support. Also, it does export 
a photo with openexr without complaint and I can open it (I just tried in Gimp).

It seems like moving to openexr 3 should be done to address security issues: 
https://issues.guix.gnu.org/47509 This looks like it may involve patching many 
of the dependent packages, based on what I see in Arch (which only has openexr 
3 and numerous small patches, though looked easy enough).

So I think this update to Darktable is okay, but we should move to openexr 3 
for everything due to #47509. How does that sound to you?