Move DotNetBuild.props logic into repo

Also remove the TargetFrameworkFilter which isn't necessary as defined centrally by Arcade with the same value.

Author: ViktorHofer

Directory.Build.props

@@ -107,6 +107,8 @@
 
     <IncludeSymbols>true</IncludeSymbols>
     <DefaultNetFxTargetFramework>net462</DefaultNetFxTargetFramework>
+
+    <CrossgenOutput Condition="'$(DotNetBuildUseMonoRuntime)' == 'true'">false</CrossgenOutput>
   </PropertyGroup>
 
   <!-- Warnings and errors -->

eng/DotNetBuild.props

@@ -5,7 +5,6 @@
   <PropertyGroup>
     <GitHubRepositoryName>aspnetcore</GitHubRepositoryName>
     <SourceBuildManagedOnly>true</SourceBuildManagedOnly>
-    <SourceBuildTargetFrameworkFilter>netstandard2.0%3bnetstandard2.1%3bnetcoreapp2.1%3bnetcoreapp3.1%3bnet5.0%3bnet6.0%3bnet7.0%3bnet8.0%3bnet9.0%3bnet10.0</SourceBuildTargetFrameworkFilter>
   </PropertyGroup>
 
   <!--
@@ -60,14 +59,6 @@
       Condition="'$(OS)' == 'Windows_NT'" />
   </Target>
 
-  <Target Name="CustomizeInnerBuildArgs"
-          BeforeTargets="GetSourceBuildCommandConfiguration">
-
-    <PropertyGroup>
-      <InnerBuildArgs Condition="'$(DotNetBuildUseMonoRuntime)' == 'true'">$(InnerBuildArgs) /p:CrossgenOutput=false</InnerBuildArgs>
-    </PropertyGroup>
-  </Target>
-
   <Target Name="GetAspnetcoreCategorizedIntermediateNupkgContents"
           BeforeTargets="GetCategorizedIntermediateNupkgContents">
     <PropertyGroup>