clean up cmake test code

tests/testfggl/CMakeLists.txt

 enable_testing()
 
 add_executable( fggl_test
-	TestFggl.cpp
+#	TestFggl.cpp
 #	ecs/ecs.cpp
 #	ecs3/ecs.cpp
 #	ecs3/easing.cpp
@@ -23,8 +23,3 @@ target_link_libraries(fggl_test
 
 include(GoogleTest)
 gtest_discover_tests(fggl_test)
-
-add_test(
-	NAME gtest
-	COMMAND $<TARGET_FILE:fggl_test>
-)