misc mingw: Get rid of crossConfig and clean up

Style of dual implementation and headers derivations is take from
bb7067f882.

pkgs/os-specific/windows/mingwrt/common.nix

@@ -0,0 +1,12 @@
+{ lib, fetchurl }:
+
+rec {
+  name = "mingwrt-3.20";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/mingw/MinGW/Base/mingw-rt/${name}-mingw32-src.tar.gz";
+    sha256 = "02pydg1m8y35nxb4k34nlb5c341y2waq76z42mgdzlcf661r91pi";
+  };
+
+  meta.platforms = [ lib.systems.inspect.isMinGW ];
+}

pkgs/os-specific/windows/mingwrt/default.nix

@@ -1,29 +1,7 @@
-{stdenv, fetchurl, binutils ? null, gccCross ? null, onlyHeaders ? false}:
+{ stdenv, callPackage }:
-
-let
-  name = "mingwrt-3.20";
-in
-stdenv.mkDerivation (rec {
-  inherit name;
-
-  src = fetchurl {
-    url = "mirror://sourceforge/mingw/MinGW/Base/mingw-rt/${name}-mingw32-src.tar.gz";
-    sha256 = "02pydg1m8y35nxb4k34nlb5c341y2waq76z42mgdzlcf661r91pi";
-  };
-
-} //
-(if onlyHeaders then {
-  name = name + "-headers";
-  phases = [ "unpackPhase" "installPhase" ];
-  installPhase = ''
-    mkdir -p $out
-    cp -R include $out
-  '';
-} else {
-  buildInputs = [ gccCross binutils ];
-
-  crossConfig = gccCross.crossConfig;
 
+stdenv.mkDerivation {
+  inherit (callPackage ./common.nix {}) name src meta;
   dontStrip = true;
-})
+  hardeningDisable = [ "stackprotector" "fortify" ];
-)
+}

pkgs/os-specific/windows/mingwrt/headers.nix

@@ -0,0 +1,17 @@
+{ stdenvNoCC, callPackage }:
+
+let
+  inherit (callPackage ./common.nix {}) name src meta;
+
+in stdenvNoCC.mkDerivation {
+  name = name + "-headers";
+
+  inherit src meta;
+
+  phases = [ "unpackPhase" "installPhase" ];
+
+  installPhase = ''
+    mkdir -p $out
+    cp -R include $out
+  '';
+}

pkgs/os-specific/windows/w32api/common.nix

@@ -0,0 +1,14 @@
+{ fetchurl, xz }:
+
+rec {
+  name = "w32api-3.17-2";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/mingw/MinGW/Base/w32api/w32api-3.17/${name}-mingw32-src.tar.lzma";
+    sha256 = "09rhnl6zikmdyb960im55jck0rdy5z9nlg3akx68ixn7khf3j8wb";
+  };
+
+  nativeBuildInputs = [ xz ];
+
+  meta.platforms = [ lib.systems.inspect.isMinGW ];
+}

pkgs/os-specific/windows/w32api/default.nix

@@ -1,32 +1,6 @@
-{ stdenv, fetchurl, xz, binutils ? null
+{ stdenv, callPackage }:
-, gccCross ? null, onlyHeaders ? false }:
-
-let
-  name = "w32api-3.17-2";
-in
-stdenv.mkDerivation ({
-  inherit name;
-
-  src = fetchurl {
-    url = "mirror://sourceforge/mingw/MinGW/Base/w32api/w32api-3.17/${name}-mingw32-src.tar.lzma";
-    sha256 = "09rhnl6zikmdyb960im55jck0rdy5z9nlg3akx68ixn7khf3j8wb";
-  };
-
-  nativeBuildInputs = [ xz ];
-
-} //
-(if onlyHeaders then {
-  name = name + "-headers";
-  phases = [ "unpackPhase" "installPhase" ];
-  installPhase = ''
-    mkdir -p $out
-    cp -R include $out
-  '';
-} else {
-  buildInputs = [ gccCross binutils ];
-
-  crossConfig = gccCross.crossConfig;
 
+stdenv.mkDerivation {
+  inherit (callPackage ./common.nix {}) name src nativeBuildInputs meta;
   dontStrip = true;
-})
+}
-)

pkgs/os-specific/windows/w32api/headers.nix

@@ -0,0 +1,17 @@
+{ stdenvNoCC, callPackage }:
+
+let
+  inherit (callPackage ./common.nix {}) name src meta;
+
+in stdenvNoCC.mkDerivation {
+  name = name + "-headers";
+
+  inherit src nativeBuildInputs meta;
+
+  phases = [ "unpackPhase" "installPhase" ];
+
+  installPhase = ''
+    mkdir -p $out
+    cp -R include $out
+  '';
+}

pkgs/top-level/all-packages.nix

@@ -13868,23 +13868,13 @@ with pkgs;
 
     jom = callPackage ../os-specific/windows/jom { };
 
-    w32api = callPackage ../os-specific/windows/w32api {
+    w32api = callPackage ../os-specific/windows/w32api { };
-      gccCross = gccCrossStageStatic;
-      binutils = binutils;
-    };
 
-    w32api_headers = w32api.override {
+    w32api_headers = callPackage ../os-specific/windows/w32api/headers { };
-      onlyHeaders = true;
-    };
 
-    mingw_runtime = callPackage ../os-specific/windows/mingwrt {
+    mingw_runtime = callPackage ../os-specific/windows/mingwrt { };
-      gccCross = gccCrossMingw2;
-      binutils = binutils;
-    };
 
-    mingw_runtime_headers = mingw_runtime.override {
+    mingw_runtime_headers = callPackage ../os-specific/windows/mingwrt/headers.nix { };
-      onlyHeaders = true;
-    };
 
     mingw_headers1 = buildEnv {
       name = "mingw-headers-1";