treewide: pkgs.pkgconfig -> pkgs.pkg-config, move pkgconfig to alias.nix

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.

pkgs/servers/dns/dnsdist/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkgconfig, systemd
+{ lib, stdenv, fetchurl, pkg-config, systemd
 , boost, libsodium, libedit, re2
 , net-snmp, lua, protobuf, openssl, zlib, h2o
 }:
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
     sha256 = "1wgv19b6y4fp5x1z54psaaialji2rckl5vdh156kyw47k9r5krya";
   };
 
-  nativeBuildInputs = [ pkgconfig protobuf ];
+  nativeBuildInputs = [ pkg-config protobuf ];
   buildInputs = [ systemd boost libsodium libedit re2 net-snmp lua openssl zlib h2o ];
 
   configureFlags = [

pkgs/servers/dns/knot-dns/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkgconfig, gnutls, liburcu, lmdb, libcap_ng, libidn2, libunistring
+{ lib, stdenv, fetchurl, pkg-config, gnutls, liburcu, lmdb, libcap_ng, libidn2, libunistring
 , systemd, nettle, libedit, zlib, libiconv, libintl, libmaxminddb, libbpf, nghttp2
 , autoreconfHook
 }:
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     ./runtime-deps.patch
   ];
 
-  nativeBuildInputs = [ pkgconfig autoreconfHook ];
+  nativeBuildInputs = [ pkg-config autoreconfHook ];
   buildInputs = [
     gnutls liburcu libidn2 libunistring
     nettle libedit

pkgs/servers/dns/knot-resolver/default.nix

@@ -1,6 +1,6 @@
 { lib, stdenv, fetchurl, fetchpatch
 # native deps.
-, runCommand, pkgconfig, meson, ninja, makeWrapper
+, runCommand, pkg-config, meson, ninja, makeWrapper
 # build+runtime deps.
 , knot-dns, luajitPackages, libuv, gnutls, lmdb
 , systemd, libcap_ng, dns-root-data, nghttp2 # optionals, in principle
@@ -50,7 +50,7 @@ unwrapped = stdenv.mkDerivation rec {
     patchShebangs scripts/
   '';
 
-  nativeBuildInputs = [ pkgconfig meson ninja ];
+  nativeBuildInputs = [ pkg-config meson ninja ];
 
   # http://knot-resolver.readthedocs.io/en/latest/build.html#requirements
   buildInputs = [ knot-dns lua.lua libuv gnutls lmdb ]

pkgs/servers/dns/pdns-recursor/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkgconfig, boost, nixosTests
+{ lib, stdenv, fetchurl, pkg-config, boost, nixosTests
 , openssl, systemd, lua, luajit, protobuf
 , enableProtoBuf ? false
 }:
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
     sha256 = "1kzmliim2pwh04y3y6bpai9fm0qmdicrmff09fv5h5wahi4pzfdh";
   };
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkg-config ];
   buildInputs = [
     boost openssl systemd
     lua luajit

pkgs/servers/dns/powerdns/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, fetchpatch, pkgconfig, nixosTests
+{ lib, stdenv, fetchurl, fetchpatch, pkg-config, nixosTests
 , boost, libyamlcpp, libsodium, sqlite, protobuf, openssl, systemd
 , mysql57, postgresql, lua, openldap, geoip, curl, unixODBC
 }:
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkg-config ];
   buildInputs = [
     boost mysql57.connector-c postgresql lua openldap sqlite protobuf geoip
     libyamlcpp libsodium curl unixODBC openssl systemd