graphics/darktable: Update to 1.4.2
The following changes were made to options:
o Remove GCC option (see below)
o Remove KWALLET option (unused)
o Rename FACEBOOK option to FB_PICASA, because both export features
depend on json-glib.
o Add COLORD option (color management)
o Add GRAPHMAGICK option (support GraphicsMagick's image formats)
o Add LUA option (embed Lua to add scripting)
o Add OPENEXR option (support HDR image format)
o Add SQUISH option (use libsquish to compress thumbnails)
o Add WEBP option (support WebP image format)
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Update freetype to 2.5.2.
Remove patch to add -I/usr/local/include in freetype-config --cflags. If
ports need extra headers they should look for them, and not get them via
Freetype had a header resuffle in 2.5.1, patch ports to use the new header
Thanks go to bdrewery for the two exp-runs and rakuco for helping me with
some troublesome cmake ports.