CMake - emscripten hack

Add a commented out line for the emscripten hack to indicate what to do when compiling for the platform.
resolves #99

CMakeLists.txt

@@ -26,6 +26,9 @@ if(NOT EXISTS "${CMAKE_CURRENT_LIST_DIR}/godot-cpp/src")
 endif()
 add_subdirectory(godot-cpp SYSTEM)
 
+# When compiling for emscripten, this toolchainhack needs to be included.
+# set(CMAKE_PROJECT_<project-name>_INCLUDE ${godot-cpp_SOURCE_DIR}/cmake/emsdkHack.cmake)
+
 # Create the gen directory at configure time so IDEs can see generated headers immediately after generate_bindings
 file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/godot-cpp/gen/include")