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/faust/faust1.nix

@@ -2,7 +2,7 @@
 , coreutils
 , fetchurl
 , makeWrapper
-, pkgconfig
+, pkg-config
 }:
 
 with lib.strings;
@@ -159,7 +159,7 @@ let
 
     stdenv.mkDerivation ((faust2ApplBase args) // {
 
-      nativeBuildInputs = [ pkgconfig ];
+      nativeBuildInputs = [ pkg-config ];
       buildInputs = [ makeWrapper ];
 
       propagatedBuildInputs = [ faust ] ++ propagatedBuildInputs;

pkgs/applications/audio/faust/faust2.nix

@@ -2,7 +2,7 @@
 , coreutils
 , fetchFromGitHub
 , makeWrapper
-, pkgconfig
+, pkg-config
 , cmake
 , llvm
 , emscripten
@@ -45,7 +45,7 @@ let
 
     inherit src;
 
-    nativeBuildInputs = [ makeWrapper pkgconfig cmake vim which ];
+    nativeBuildInputs = [ makeWrapper pkg-config cmake vim which ];
     buildInputs = [ llvm emscripten openssl libsndfile libmicrohttpd gnutls libtasn1 p11-kit ];
 
 
@@ -168,7 +168,7 @@ let
 
     stdenv.mkDerivation ((faust2ApplBase args) // {
 
-      nativeBuildInputs = [ pkgconfig ];
+      nativeBuildInputs = [ pkg-config ];
       buildInputs = [ makeWrapper ];
 
       propagatedBuildInputs = [ faust ] ++ propagatedBuildInputs;

pkgs/applications/audio/faust/faust2jackrust.nix

@@ -6,7 +6,7 @@
 , gcc
 , gnumake
 , openssl
-, pkgconfig
+, pkg-config
 
 }:
 
@@ -14,5 +14,5 @@ faust.wrapWithBuildEnv {
 
   baseName = "faust2jackrust";
 
-  propagatedBuildInputs = [ libjack2 cargo binutils gcc gnumake openssl pkgconfig ];
+  propagatedBuildInputs = [ libjack2 cargo binutils gcc gnumake openssl pkg-config ];
 }