_LinkNativeRuntime must be called earlier

Otherwise `<FileWrites>` in `_CompileNativeAssemblySources` won't
actually get written to the cache and the `GenerateJavaStubsAndAssembly`
test fails.

Author: grendello

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

@@ -1880,6 +1880,7 @@ because xbuild doesn't support framework reference assemblies.
 	<_CompileToDalvikDependsOnTargets>
 		_CompileJava;
 		_CreateApplicationSharedLibraries;
+		_LinkNativeRuntime;
 		_GetMonoPlatformJarPath;
 		_GetLibraryImports;
 		_SetProguardMappingFileProperty;