Fixed VC++ warnings.

src/win32_window.c

@@ -41,6 +41,7 @@
 
 static void hideCursor(_GLFWwindow* window)
 {
+    UNREFERENCED_PARAMETER(window);
 }
 
 
@@ -69,6 +70,8 @@ static void captureCursor(_GLFWwindow* window)
 
 static void showCursor(_GLFWwindow* window)
 {
+    UNREFERENCED_PARAMETER(window);
+
     // Un-capture cursor
     ReleaseCapture();