continuation of #109595
pkgconfig was aliased in 2018, however, it remained in
all-packages.nix due to its wide usage. This cleans
up the remaining references to pkgs.pkgsconfig and
moves the entry to aliases.nix.
python3Packages.pkgconfig remained unchanged because
it's the canonical name of the upstream package
on pypi.
I had this package along with libgaminggear laying around since June
2016[1] and basically just did the setup for the ROCCAT device once and
never touched it again since then. However, I got requests from other
users who might need this, so I decided to finally upstream it along
with using the latest versions.
There were a few hardcoded paths to fix, like eg. /etc/xdg and another
one that used /var/lib/roccat, the latter I moved into $XDG_DATA_HOME
instead.
The reason why I put it in os-specific/linux is that the official site
explicitly states that it's for Linux only and I specified the platforms
attribute accordingly.
[1]: https://gist.github.com/aszlig/3a01c0c23254a68c2be4c6df59e26862
Signed-off-by: aszlig <aszlig@nix.build>
Cc: @devhell
