Lots of packages can use it. Here is the list:

- jackmix
- klick
- mixx
- nova-filters
- rhvoice
- giv
- mypaint
- swift-im
- bombono
- mapnik
- serf
- nuitka
- pyexiv2
- godot
- hammer
- toluapp
- btanks
- dxx-rebirth
- endless-sky
- globulation
- the-powder-toy
- fceux
- gpsd
- mongodb
- rippled
- mariadb
- lprof

There’s nothing wrong with unstable packages when they are maintained
and frequently updated. However, when they become out-of-date, as many
do, it is usually best to just get rid of them as the stable version
is become newer than the unstable version. This removes any packages
called "unstable" that have not been updated in over 1 year. Affected
packages include:

- isyncUnstable
- sxhkd-unstable
- dosbox-unstable

Revert "treewide: remove unstable packages"

This reverts commit df01b0b.

This flag seems to make things work again.

Add setup-hooks for scons and waf

xboxdrv doesn’t use scons for installing, but instead using a
makefile! Everything else is in scons so we have to keep that. I’ve
added a dontUseSconsInstall flag to the scons setup-hook to skip the
automatic overwrite of default “make install” call.

This gives us support for the class autoconf “./configure && make &&
make install” build-style.

The postInstall phase should not run postInstall itself! My mistake in
renaming the old installPhase.

gsettingsschemedir only works in make where you can set any variable
from the command line as in “make VAR=VAL”. Other build systems may
not support this kind of loose overriding of variables. This broke a
scons build here:

  https://hydra.nixos.org/build/84073119/

Fallout fixes from #50293

Update metadata to reflect uncompyle6 and xdis relicensing to GPL (v3 and v2 respectively)

This requires pycodestyle when using python3 and adding it leads to test
failures for some reason. Maybe some patching we do. There is no reason to
test codestyle for a distro, so just disable it.

These two interpreters are needed for some runtime scripts.

Fixes #50570

ghc-split is a script that is written in perl. We need to have a perl interpreter around to use it.

Fixes #50569

This is one of the rare times when flex is not just needed at build
time. When cross compiling, we will need 2 versions of flex - one for
the local system and one for the cross system.