Add glfwSetWindowMonitor

This adds the ability to switch between windowed and full screen modes,
move a full screen window between monitors and update its desired
resolution and refresh rate.

Fixes #43.

src/mir_window.c

@@ -508,6 +508,16 @@ void _glfwPlatformFocusWindow(_GLFWwindow* window)
                     "Mir: Unsupported function %s", __PRETTY_FUNCTION__);
 }
 
+void _glfwPlatformSetWindowMonitor(_GLFWwindow* window,
+                                   _GLFWmonitor* monitor,
+                                   int xpos, int ypos,
+                                   int width, int height,
+                                   int refreshRate)
+{
+    _glfwInputError(GLFW_PLATFORM_ERROR,
+                    "Mir: Unsupported function %s", __PRETTY_FUNCTION__);
+}
+
 int _glfwPlatformWindowFocused(_GLFWwindow* window)
 {
     _glfwInputError(GLFW_PLATFORM_ERROR,