Add package references required for Xamarin.Android 15.8 to compile applications

build/System.Memory.props

@@ -1,5 +1,8 @@
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <PackageReference Include="System.Memory" Version="4.5.1" />
+    <!-- WORKAROUND: The packages below are transitively referenced by System.Memory, but Xamarin.Android needs them directly referenced for the linker. -->
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.1" />
+    <PackageReference Include="System.Buffers" Version="4.5.0" />
   </ItemGroup>
 </Project>