Fix warning while using external GLFW older than version 3.4.0 (#3599)

Co-authored-by: Marco Maia <marco.maia@iarasystems.com.br>

src/platforms/rcore_desktop.c

@@ -88,11 +88,6 @@
 //----------------------------------------------------------------------------------
 // Defines and Macros
 //----------------------------------------------------------------------------------
-// TODO: HACK: Added flag if not provided by GLFW when using external library
-// Latest GLFW release (GLFW 3.3.8) does not implement this flag, it was added for 3.4.0-dev
-#if !defined(GLFW_MOUSE_PASSTHROUGH)
-    #define GLFW_MOUSE_PASSTHROUGH      0x0002000D
-#endif
 
 //----------------------------------------------------------------------------------
 // Types and Structures Definition
@@ -396,11 +391,13 @@ void SetWindowState(unsigned int flags)
     }
 
     // State change: FLAG_WINDOW_MOUSE_PASSTHROUGH
+#if defined (GLFW_MOUSE_PASSTHROUGH)
     if (((CORE.Window.flags & FLAG_WINDOW_MOUSE_PASSTHROUGH) != (flags & FLAG_WINDOW_MOUSE_PASSTHROUGH)) && ((flags & FLAG_WINDOW_MOUSE_PASSTHROUGH) > 0))
     {
         glfwSetWindowAttrib(platform.handle, GLFW_MOUSE_PASSTHROUGH, GLFW_TRUE);
         CORE.Window.flags |= FLAG_WINDOW_MOUSE_PASSTHROUGH;
     }
+#endif
 
     // State change: FLAG_MSAA_4X_HINT
     if (((CORE.Window.flags & FLAG_MSAA_4X_HINT) != (flags & FLAG_MSAA_4X_HINT)) && ((flags & FLAG_MSAA_4X_HINT) > 0))
@@ -509,11 +506,13 @@ void ClearWindowState(unsigned int flags)
     }
 
     // State change: FLAG_WINDOW_MOUSE_PASSTHROUGH
+#if defined (GLFW_MOUSE_PASSTHROUGH)
     if (((CORE.Window.flags & FLAG_WINDOW_MOUSE_PASSTHROUGH) > 0) && ((flags & FLAG_WINDOW_MOUSE_PASSTHROUGH) > 0))
     {
         glfwSetWindowAttrib(platform.handle, GLFW_MOUSE_PASSTHROUGH, GLFW_FALSE);
         CORE.Window.flags &= ~FLAG_WINDOW_MOUSE_PASSTHROUGH;
     }
+#endif
 
     // State change: FLAG_MSAA_4X_HINT
     if (((CORE.Window.flags & FLAG_MSAA_4X_HINT) > 0) && ((flags & FLAG_MSAA_4X_HINT) > 0))
@@ -1316,8 +1315,10 @@ int InitPlatform(void)
     else glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_FALSE);
 
     // Mouse passthrough
+#if defined (GLFW_MOUSE_PASSTHROUGH)
     if ((CORE.Window.flags & FLAG_WINDOW_MOUSE_PASSTHROUGH) > 0) glfwWindowHint(GLFW_MOUSE_PASSTHROUGH, GLFW_TRUE);
     else glfwWindowHint(GLFW_MOUSE_PASSTHROUGH, GLFW_FALSE);
+#endif
 
     if (CORE.Window.flags & FLAG_MSAA_4X_HINT)
     {