buildDotnetPackage: move buildInputs to nativeBuildInputs

they're run during the build so they belong there

pkgs/build-support/build-dotnet-package/default.nix

@@ -4,7 +4,6 @@ attrsOrig @
 { baseName
 , version
 , nativeBuildInputs ? []
-, buildInputs ? []
 , xBuildFiles ? [ ]
 , xBuildFlags ? [ "/p:Configuration=Release" ]
 , outputFiles ? [ "bin/Release/*" ]
@@ -22,12 +21,10 @@ attrsOrig @
 
       nativeBuildInputs = [
         pkg-config
-      ] ++ nativeBuildInputs;
-      buildInputs = [
-        mono
-        dotnetbuildhelpers
         makeWrapper
-      ] ++ buildInputs;
+        dotnetbuildhelpers
+        mono
+      ] ++ nativeBuildInputs;
 
       configurePhase = ''
         runHook preConfigure
@@ -90,7 +87,7 @@ attrsOrig @
             then
               echo "$dll already exported by a buildInputs, not re-exporting"
             else
-              ${dotnetbuildhelpers}/bin/create-pkg-config-for-dll.sh "$out/lib/pkgconfig" "$dll"
+              create-pkg-config-for-dll.sh "$out/lib/pkgconfig" "$dll"
             fi
           done
         done
@@ -116,4 +113,4 @@ attrsOrig @
       '';
     };
   in
-    stdenv.mkDerivation (attrs // (builtins.removeAttrs attrsOrig [ "nativeBuildInputs" "buildInputs" ] ))
+    stdenv.mkDerivation (attrs // (builtins.removeAttrs attrsOrig [ "nativeBuildInputs" ] ))