graphics/darktable: update to 3.0.2

This is an upgrade for darktable from 3.0.0 to 3.0.2, with
Ludger's changes from the original PR submission:

• export to Flickr, Facebook and Google Photo removed as [they are] no longer supported in 3.0.2

And these changes by mandree@:

• rediff patches
• reshuffle Makefile per portclippy recommendation
• remove COLORD option, it's not technically required to build, but a a raw image processing application without color management makes little sense. This option was default-on anyways.

Changes 3.0.0 -> 3.0.1:
https://www.darktable.org/2020/03/darktable-301-released/
https://github.com/darktable-org/darktable/releases/tag/release-3.0.1

Changes 3.0.1 -> 3.0.2:
https://www.darktable.org/2020/04/darktable-302-released/
https://github.com/darktable-org/darktable/releases/tag/release-3.0.2

PR: 246065
Submitted by: Ludger Bolmerg <lbolmerg@posteo.de>
Approved by: Jean-Sébastien Pédron <dumbbell@> (maintainer)