Update all usage of lib.concatStrings (lib.intersperse ...) to
lib.concatStringsSep. This produces the same result as per https://github.com/NixOS/nixpkgs/pull/135843,
however it yields a performance benefit on Nix versions that
support the builtins.concatStringsSep primop.
These are all packages that I stopped using and hence just create noise
in my inbox for each change affecting them and let's face it, while I
still enjoy contributing to nixpkgs, it doesn't really make sense to be
listed there if I can't do much anyways.
Each of these packages can be taken over by someone or removed if
people think that's reasonable.
Of course, if other maintainers face issues, I can answer some questions
if needed & possible.
The program `nip2` didn't really work without this, as it didn't know
where to find the bundled scripts. Though VIPSHOME should really be
called NIP2HOME. I suppose I should open an issue upstream to also
consider `datarootdir` from autotools?
The new optional dependencies increase closure size from 388.92 MiB to
414.0 MiB, a negligible change. I didn't think there was any reason to
add `withLibjpeg ? true` flags (or `enableLibjpeg`).
The optional dependencies are sorted in the order of
https://github.com/libvips/libvips/blob/master/README.md
and I have used `nix log` on the build to check they are all picked up
in configure.
The python3 support was in for ages
(https://github.com/libvips/libvips/issues/202), the remaining python3
support in tools/vipsprofile landed in
https://github.com/libvips/libvips/pull/1262 so I upgraded it to
python3. I wasn't sure if I should use a specific version, or just leave
it as python3.
I have tested vipsprofile with
```
./vips-pycairo-bin/bin/vips gaussblur ~/2021-04-30-092143_3286x1080_scrot.png x.tif 5 --vips-profile
./vips-pycairo-bin/bin/vipsprofile
```
where ~/2021-04-30-092143_3286x1080_scrot.png is just a random image
(screenshot) I had lying around. It seems to have generated an SVG file,
I don't know how to interpret it.
* xcolor: unstable -> 0.5.0
Also create a desktop item so xcolor shows up in application launchers.
* xcolor: cleanup install phase
Use available utility functions for installing man pages and desktop items. Also
cleanup redundant icon copy lines.
