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/applications/audio/deadbeef/default.nix

@@ -3,7 +3,7 @@
 , automake
 , libtool
 , intltool
-, pkgconfig
+, pkg-config
 , jansson
 # deadbeef can use either gtk2 or gtk3
 , gtk2Support ? false, gtk2 ? null
@@ -97,7 +97,7 @@ stdenv.mkDerivation rec {
     automake
     intltool
     libtool
-    pkgconfig
+    pkg-config
   ] ++ lib.optional gtk3Support wrapGAppsHook;
 
   enableParallelBuilding = true;

pkgs/applications/audio/deadbeef/plugins/headerbar-gtk3.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, autoconf, automake, libtool, pkgconfig, libxml2, deadbeef, glib, gtk3 }:
+{ lib, stdenv, fetchFromGitHub, autoconf, automake, libtool, pkg-config, libxml2, deadbeef, glib, gtk3 }:
 
 stdenv.mkDerivation rec {
   pname = "deadbeef-headerbar-gtk3-plugin";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "1v1schvnps7ypjqgcbqi74a45w8r2gbhrawz7filym22h1qr9wn0";
   };
 
-  nativeBuildInputs = [ autoconf automake libtool pkgconfig libxml2 ];
+  nativeBuildInputs = [ autoconf automake libtool pkg-config libxml2 ];
   buildInputs = [ deadbeef glib gtk3 ];
 
   # Choose correct installation path

pkgs/applications/audio/deadbeef/plugins/infobar.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkgconfig, deadbeef, gtk3, libxml2 }:
+{ lib, stdenv, fetchurl, pkg-config, deadbeef, gtk3, libxml2 }:
 
 stdenv.mkDerivation rec {
   pname = "deadbeef-infobar-plugin";
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "0c9wh3wh1hdww7v96i8cy797la06mylhfi0880k8vwh88079aapf";
   };
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkg-config ];
   buildInputs = [ deadbeef gtk3 libxml2 ];
 
   buildFlags = [ "gtk3" ];

pkgs/applications/audio/deadbeef/plugins/lyricbar.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, pkgconfig, deadbeef, gtkmm3, libxmlxx3 }:
+{ lib, stdenv, fetchFromGitHub, pkg-config, deadbeef, gtkmm3, libxmlxx3 }:
 
 stdenv.mkDerivation {
   pname = "deadbeef-lyricbar-plugin";
@@ -11,7 +11,7 @@ stdenv.mkDerivation {
     sha256 = "108hx5530f4xm8p9m2bk79nq7jkhcj39ad3vmxb2y6h6l2zv5kwl";
   };
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkg-config ];
   buildInputs = [ deadbeef gtkmm3 libxmlxx3 ];
 
   buildFlags = [ "gtk3" ];

pkgs/applications/audio/deadbeef/plugins/mpris2.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkgconfig, deadbeef, glib }:
+{ lib, stdenv, fetchurl, pkg-config, deadbeef, glib }:
 
 stdenv.mkDerivation rec {
   pname = "deadbeef-mpris2-plugin";
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "0s3y4ka4qf38cypc0xspy79q0g5y1kqx6ldad7yr6a45nw6j95jh";
   };
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkg-config ];
 
   buildInputs = [ deadbeef glib ];