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.
Installing libtk on macOS 10.15.5 resulted in a following warning:
warning: skipping dangling symlink '/nix/store/3whl4256v6qf15dsm1d5mf0lzhfh6w06-user-environment/lib/libtk.so'
which was caused by the following code in generic.nix of the tk derivation:
ln -s $out/lib/libtk${super.tcl.release}.so $out/lib/libtk.so
Shared libraries on macOS are suffixed `.dylib' not 'so' so
libtk${version}.so does not actually exist. Consequently a symlink from
libtk.dylib is never created and linking against tk fails.
He prefers to contribute to his own nixpkgs fork triton.
Since he is still marked as maintainer in many packages
this leaves the wrong impression he still maintains those.
