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/haskell-modules/generic-builder.nix

@@ -7,7 +7,7 @@ let
   isCross = stdenv.buildPlatform != stdenv.hostPlatform;
   inherit (buildPackages)
     fetchurl removeReferencesTo
-    pkgconfig coreutils gnugrep gnused glibcLocales;
+    pkg-config coreutils gnugrep gnused glibcLocales;
 in
 
 { pname
@@ -54,7 +54,7 @@ in
 , doCoverage ? false
 , doHaddock ? !(ghc.isHaLVM or false)
 , passthru ? {}
-, pkgconfigDepends ? [], libraryPkgconfigDepends ? [], executablePkgconfigDepends ? [], testPkgconfigDepends ? [], benchmarkPkgconfigDepends ? []
+, pkg-configDepends ? [], libraryPkgconfigDepends ? [], executablePkgconfigDepends ? [], testPkgconfigDepends ? [], benchmarkPkgconfigDepends ? []
 , testDepends ? [], testHaskellDepends ? [], testSystemDepends ? [], testFrameworkDepends ? []
 , benchmarkDepends ? [], benchmarkHaskellDepends ? [], benchmarkSystemDepends ? [], benchmarkFrameworkDepends ? []
 , testTarget ? ""
@@ -234,7 +234,7 @@ let
 
   isHaskellPkg = x: x ? isHaskellLibrary;
 
-  allPkgconfigDepends = pkgconfigDepends ++ libraryPkgconfigDepends ++ executablePkgconfigDepends ++
+  allPkgconfigDepends = pkg-configDepends ++ libraryPkgconfigDepends ++ executablePkgconfigDepends ++
                         optionals doCheck testPkgconfigDepends ++ optionals doBenchmark benchmarkPkgconfigDepends;
 
   depsBuildBuild = [ nativeGhc ];
@@ -243,7 +243,7 @@ let
     optionals doCheck testToolDepends ++
     optionals doBenchmark benchmarkToolDepends;
   nativeBuildInputs =
-    [ ghc removeReferencesTo ] ++ optional (allPkgconfigDepends != []) pkgconfig ++
+    [ ghc removeReferencesTo ] ++ optional (allPkgconfigDepends != []) pkg-config ++
     setupHaskellDepends ++ collectedToolDepends;
   propagatedBuildInputs = buildDepends ++ libraryHaskellDepends ++ executableHaskellDepends ++ libraryFrameworkDepends;
   otherBuildInputsHaskell =
@@ -285,7 +285,7 @@ let
   '';
 in stdenv.lib.fix (drv:
 
-assert allPkgconfigDepends != [] -> pkgconfig != null;
+assert allPkgconfigDepends != [] -> pkg-config != null;
 
 stdenv.mkDerivation ({
   name = "${pname}-${version}";
@@ -532,7 +532,7 @@ stdenv.mkDerivation ({
         libraryPkgconfigDepends
         librarySystemDepends
         libraryToolDepends
-        pkgconfigDepends
+        pkg-configDepends
         setupHaskellDepends
         ;
     } // stdenv.lib.optionalAttrs doCheck {
@@ -616,7 +616,7 @@ stdenv.mkDerivation ({
 
         depsBuildBuild = stdenv.lib.optional isCross ghcEnvForBuild;
         nativeBuildInputs =
-          [ ghcEnv ] ++ optional (allPkgconfigDepends != []) pkgconfig ++
+          [ ghcEnv ] ++ optional (allPkgconfigDepends != []) pkg-config ++
           collectedToolDepends;
         buildInputs =
           otherBuildInputsSystem;