Ability to modify REF_COUNT_FOR_GLFW

Hello,

I'd like to request a way to set the global ``REF_COUNT_FOR_GLFW`` variable, which is used to check whether terminate glfwTerminate should be called.

Currently, this behavior is fine, if there is no hidden GLFW usage,  which is not true if there is C or C++ code present using GLFW.

Could there be an unsafe method that would allow us to increment the ``REF_COUNT_FOR_GLFW``  variable?