Moved platform specific monitor list creation part to separate functions.

src/x11_platform.h

@@ -280,7 +280,8 @@ void _glfwInitJoysticks(void);
 void _glfwTerminateJoysticks(void);
 
 // Monitors
-void _glfwInitMonitors(void);
+_GLFWmonitor* _glfwCreateMonitors(void);
+_GLFWmonitor* _glfwDestroyMonitor(_GLFWmonitor* monitor);
 
 // Unicode support
 long _glfwKeySym2Unicode(KeySym keysym);