Run all tests with C++11 enabled (#1820)

extras/tests/JsonVariant/CMakeLists.txt

@@ -16,12 +16,14 @@ add_executable(JsonVariantTests
 	memoryUsage.cpp
 	misc.cpp
 	nesting.cpp
+	nullptr.cpp
 	or.cpp
 	overflow.cpp
 	remove.cpp
 	set.cpp
 	shallowCopy.cpp
 	size.cpp
+	stl_containers.cpp
 	subscript.cpp
 	types.cpp
 	unbound.cpp