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/development/libraries/aqbanking/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, gmp, gwenhywfar, libtool, libxml2, libxslt
-, pkgconfig, gettext, xmlsec, zlib
+, pkg-config, gettext, xmlsec, zlib
 }:
 
 let
@@ -25,7 +25,7 @@ in stdenv.mkDerivation rec {
 
   buildInputs = [ gmp gwenhywfar libtool libxml2 libxslt xmlsec zlib ];
 
-  nativeBuildInputs = [ pkgconfig gettext ];
+  nativeBuildInputs = [ pkg-config gettext ];
 
   meta = with stdenv.lib; {
     description = "An interface to banking tasks, file formats and country information";

pkgs/development/libraries/aqbanking/gwenhywfar.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, gnutls, openssl, libgcrypt, libgpgerror, pkgconfig, gettext
+{ stdenv, fetchurl, gnutls, openssl, libgcrypt, libgpgerror, pkg-config, gettext
 , which
 
 # GUI support
@@ -53,7 +53,7 @@ in stdenv.mkDerivation rec {
       configure
   '';
 
-  nativeBuildInputs = [ pkgconfig gettext which ];
+  nativeBuildInputs = [ pkg-config gettext which ];
 
   buildInputs = [ gtk2 gtk3 qt5.qtbase gnutls openssl libgcrypt libgpgerror ];
 

pkgs/development/libraries/aqbanking/libchipcard.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, gwenhywfar, pcsclite, zlib }:
+{ stdenv, fetchurl, pkg-config, gwenhywfar, pcsclite, zlib }:
 
 let
   inherit ((import ./sources.nix).libchipcard) sha256 releaseId version;
@@ -11,7 +11,7 @@ in stdenv.mkDerivation rec {
     inherit sha256;
   };
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkg-config ];
 
   buildInputs = [ gwenhywfar pcsclite zlib ];