Avoid using pkg_resources in PIL.features.pilinfo

[nulano]

Instead of using pkg_resources, which AFAICT is part of setuptools, check the LCMS version (check added in #4963) manually.

While setuptools is very likely to already be installed, Pillow doesn't actually require it for runtime, only compilation and testing. Additionally, the pilinfo function is useful for finding configuration issues and should have as few external dependencies as possible.

Since this version string is being set in the C code, it is safe to break it back into ints and perform a tuple comparison instead.
This PR also adds a comment to make sure the two checks don't get out of sync.

[hugovk]

Yep, pkg_resources is part of setuptools, and is likely to be installed (it's used by setup.py), some users of flit (or poetry?) might not have setuptools.