gnu: Switch from windowswmproto to xorgproto.

* gnu/packages/xorg.scm (libwindowswm)[inputs]: Remove WINDOWSWMPROTO.
(windowswmproto)[properties]: Mark as superseded by XORGPROTO.

gnu/packages/xorg.scm

@@ -1248,8 +1248,7 @@ (define-public libwindowswm
     (inputs
       `(("xorgproto" ,xorgproto)
         ("libxext" ,libxext)
-        ("libx11" ,libx11)
-        ("windowswmproto" ,windowswmproto)))
+        ("libx11" ,libx11)))
     (native-inputs
       `(("pkg-config" ,pkg-config)))
     (home-page "https://www.x.org/wiki/")
@@ -1958,8 +1957,8 @@ (define-public windowswmproto
 an X11 server and the Microsoft Windows native window manager.  WindowsWM
 is only intended to be used on Cygwin when running a rootless XWin
 server.")
-    (license license:x11)))
-
+    (license license:x11)
+    (properties `((superseded . ,xorgproto)))))
 
 (define-public x11perf
   (package