graphics/darktable: Update to 2.0.5
Add several missing dependencies, as reported by make stage-qa.
Clean up port options:
o `COLORD` and `OPENEXR` had an incomplete an dependencies list. o `NLS` was broken when turned off. o `RAWSPEED` and `SQUISH` were not CMake knobs anymore in darktable.
Approved by: mat
Differential Revision: https://reviews.freebsd.org/D7147