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/compilers/rust/cargo.nix

@@ -1,4 +1,4 @@
-{ stdenv, file, curl, pkgconfig, python3, openssl, cmake, zlib
+{ stdenv, file, curl, pkg-config, python3, openssl, cmake, zlib
 , installShellFiles, makeWrapper, libiconv, cacert, rustPlatform, rustc
 , CoreFoundation, Security
 }:
@@ -16,7 +16,7 @@ rustPlatform.buildRustPackage {
   # changes hash of vendor directory otherwise
   dontUpdateAutotoolsGnuConfigScripts = true;
 
-  nativeBuildInputs = [ pkgconfig cmake installShellFiles makeWrapper ];
+  nativeBuildInputs = [ pkg-config cmake installShellFiles makeWrapper ];
   buildInputs = [ cacert file curl python3 openssl zlib ]
     ++ stdenv.lib.optionals stdenv.isDarwin [ CoreFoundation Security libiconv ];
 

pkgs/development/compilers/rust/rls/default.nix

@@ -1,5 +1,5 @@
 { stdenv, makeWrapper, fetchFromGitHub, rustPlatform
-, openssh, openssl, pkgconfig, cmake, zlib, curl, libiconv
+, openssh, openssl, pkg-config, cmake, zlib, curl, libiconv
 , CoreFoundation, Security }:
 
 rustPlatform.buildRustPackage {
@@ -28,7 +28,7 @@ rustPlatform.buildRustPackage {
   # rls-rustc links to rustc_private crates
   CARGO_BUILD_RUSTFLAGS = if stdenv.isDarwin then "-C rpath" else null;
 
-  nativeBuildInputs = [ pkgconfig cmake ];
+  nativeBuildInputs = [ pkg-config cmake ];
   buildInputs = [ openssh openssl curl zlib libiconv makeWrapper rustPlatform.rust.rustc.llvm ]
     ++ (stdenv.lib.optionals stdenv.isDarwin [ CoreFoundation Security ]);
 

pkgs/development/compilers/rust/rustc.nix

@@ -2,7 +2,7 @@
 , llvmShared, llvmSharedForBuild, llvmSharedForHost, llvmSharedForTarget
 , fetchurl, file, python3
 , darwin, cmake, rust, rustPlatform
-, pkgconfig, openssl
+, pkg-config, openssl
 , which, libffi
 , withBundledLLVM ? false
 , enableRustcDev ? true
@@ -133,7 +133,7 @@ in stdenv.mkDerivation rec {
 
   nativeBuildInputs = [
     file python3 rustPlatform.rust.rustc cmake
-    which libffi removeReferencesTo pkgconfig
+    which libffi removeReferencesTo pkg-config
   ];
 
   buildInputs = [ openssl ]