Tests: TargetObjects does not need any languages enabled

Tests/RunCMake/TargetObjects/CMakeLists.txt

@@ -1,3 +1,3 @@
 cmake_minimum_required(VERSION 3.3)
-project(${RunCMake_TEST})
+project(${RunCMake_TEST} LANGUAGES NONE)
 include(${RunCMake_TEST}.cmake)

Tests/RunCMake/TargetObjects/empty.cpp

@@ -1,4 +0,0 @@
-int empty()
-{
-  return 0;
-}