pkgs/shells: pkgconfig -> pkg-config

pkgs/shells/dgsh/default.nix

···
-{ lib, stdenv, fetchFromGitHub, autoconf, automake, pkgconfig,
+{ lib, stdenv, fetchFromGitHub, autoconf, automake, pkg-config,
   libtool, check, bison, git, gperf,
   perl, texinfo, help2man, gettext, ncurses
 }:
···
 
   patches = [ ./glibc-2.26.patch ];
 
-  nativeBuildInputs = [ autoconf automake pkgconfig libtool check
+  nativeBuildInputs = [ autoconf automake pkg-config libtool check
     bison git gettext gperf perl texinfo help2man ncurses
   ];
 

pkgs/shells/jush/default.nix

···
-{ lib, stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, editline }:
+{ lib, stdenv, fetchFromGitHub, autoreconfHook, pkg-config, editline }:
 
 stdenv.mkDerivation rec {
   pname = "jush";
···
     sha256 = "1azvghrh31gawd798a254ml4id642qvbva64zzg30pjszh1087n8";
   };
 
-  nativeBuildInputs = [ autoreconfHook pkgconfig ];
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
 
   buildInputs = [ editline ];
 

pkgs/shells/mrsh/default.nix

···
-{ lib, stdenv, fetchFromGitHub, meson, ninja, pkgconfig, readline }:
+{ lib, stdenv, fetchFromGitHub, meson, ninja, pkg-config, readline }:
 
 stdenv.mkDerivation rec {
   pname   = "mrsh";
···
     sha256 = "08gak5261d4sd6b2w2kscmdwa4gwcp5drgfyb3swyrj9cl0nlcbn";
   };
 
-  nativeBuildInputs = [ meson ninja pkgconfig ];
+  nativeBuildInputs = [ meson ninja pkg-config ];
   buildInputs = [ readline ];
 
   doCheck = true;