GLFW: X11: Include X Shape extension headers

From upstream: https://github.com/glfw/glfw/commit/68e4261d73295cc280ee3d060d421e0ace5d8d11.

glfw/x11_platform.h

@@ -51,6 +51,9 @@
 // The XInput extension provides raw mouse motion input
 #include <X11/extensions/XInput2.h>
 
+// The Shape extension provides custom window shapes
+#include <X11/extensions/shape.h>
+
 // The libxkb library is used for improved keyboard support
 #include "xkb_glfw.h"
 #include "backend_utils.h"

glfw/x11_window.c

@@ -2598,13 +2598,13 @@ void _glfwPlatformSetWindowMousePassthrough(_GLFWwindow* window, bool enabled)
     {
         Region region = XCreateRegion();
         XShapeCombineRegion(_glfw.x11.display, window->x11.handle,
-                            2/*ShapeInput*/, 0, 0, region, 0/*ShapeSet*/);
+                            ShapeInput, 0, 0, region, ShapeSet);
         XDestroyRegion(region);
     }
     else
     {
         XShapeCombineMask(_glfw.x11.display, window->x11.handle,
-                          2/*ShapeInput*/, 0, 0, None, 0/*ShapeSet*/);
+                          ShapeInput, 0, 0, None, ShapeSet);
     }
 
     window->mousePassthrough = enabled;