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.
Fixes this:
$ echo establish_context | gpshell
establish_context
establish_context failed with error 0xFFFFFFFFFFFFFFFF (libgppcscconnectionplugin.so.1.0.1: cannot open shared object file: No such file or directory)
Have to use LD_LIBRARY_PATH instead of patchelf, because it's
libglobalplatform.so.6 (from globalplatform package) that needs
libgppcscconnectionplugin.so.1.0.1, not gpshell itself. And because
RPATH doesn't "propagate" from one ELF to another, the library isn't
found. One can argue that globalplatform should depend on
gppcscconnectionplugin, but it touches on the still-unsolved "plugin"
issue in Nix packaging, so leaving that alone.
