Reuse the configuration generated by configure.sh to dynamically install
the bindings for all enabled targets. A bit of a hack grepping for the
respective lines in the Makeconf which incidentally also parse as shell.
Alternative would be to check for the target libs.
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.
