Fix copy&paste mistake in CMakeLists.txt
Fix copy&paste mistake in CMakeLists.txt

A one-word fix in copy&paste mistake in the section for checking C++11 features.
alecthomas/entityx,jarrettchisholm/entityx,jaynus/entityx,alecthomas/entityx,jaynus/entityx,jarrettchisholm/entityx,jaynus/entityx,jarrettchisholm/entityx,alecthomas/entityx