[WIP] DO use different names for the generator target

Same name but different condition works, but not really

Author: grendello

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

@@ -1626,7 +1626,7 @@ because xbuild doesn't support framework reference assemblies.
   </PrepareAbiItems>
 </Target>
 
-<Target Name="_GenerateAndroidRemapNativeCode"
+<Target Name="_GenerateEmptyAndroidRemapNativeCode"
         DependsOnTargets="_PrepareAndroidRemapNativeAssemblySources"
         Condition=" '@(_AndroidRemapMembers->Count())' == '0' "
         Inputs="$(MSBuildProjectFullPath)"
@@ -1663,6 +1663,7 @@ because xbuild doesn't support framework reference assemblies.
     _PrepareEnvironmentAssemblySources;
     _GenerateEnvironmentFiles;
     _GenerateAndroidRemapNativeCode;
+    _GenerateEmptyAndroidRemapNativeCode;
     _IncludeNativeSystemLibraries;
   </_GeneratePackageManagerJavaDependsOn>
 </PropertyGroup>