[Xamarin.Android.Build.Tasks] remove `MonoRuntimeProvider.Bundled.20.…

…java` (#8628)

In .NET 6+, the minimum API level is 21.

We can remove `MonoRuntimeProvider.Bundled.20.java`, as it was mean for devices API 20 and lower.

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.csproj

@@ -189,9 +189,6 @@
     <EmbeddedResource Include="Resources\MonoRuntimeProvider.Bundled.java">
       <LogicalName>MonoRuntimeProvider.Bundled.java</LogicalName>
     </EmbeddedResource>
-    <EmbeddedResource Include="Resources\MonoRuntimeProvider.Bundled.20.java">
-      <LogicalName>MonoRuntimeProvider.Bundled.20.java</LogicalName>
-    </EmbeddedResource>
     <EmbeddedResource Include="Resources\proguard_xamarin.cfg">
       <LogicalName>proguard_xamarin.cfg</LogicalName>
     </EmbeddedResource>

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets

@@ -1384,15 +1384,9 @@ because xbuild doesn't support framework reference assemblies.
 		DependsOnTargets="_CollectRuntimeJarFilenames;$(_BeforeAddStaticResources);_GetMonoPlatformJarPath">
 	<CopyResource ResourceName="machine.config" OutputPath="$(MonoAndroidIntermediateAssemblyDir)machine.config" />
   <CopyResource
-      Condition=" '$(_AndroidApiLevel)' &gt;= '21' "
       ResourceName="MonoRuntimeProvider.Bundled.java"
       OutputPath="$(_AndroidIntermediateJavaSourceDirectory)mono\MonoRuntimeProvider.java"
   />
-  <CopyResource
-      Condition=" '$(_AndroidApiLevel)' &lt; '21' "
-      ResourceName="MonoRuntimeProvider.Bundled.20.java"
-      OutputPath="$(_AndroidIntermediateJavaSourceDirectory)mono\MonoRuntimeProvider.java"
-  />
   <CreateTypeManagerJava
       Condition=" '$(_AndroidUseMarshalMethods)' == 'True' "
       ResourceName="JavaInteropTypeManager.java"