gnu: Add wayland-protocols-next.

This is a temporary package for a newer version of wayland-protocols for use
in hyprland.  The update is already done on mesa-updates so this package will
be removed there before the branch is merged to master.

* gnu/packages/freedesktop.scm (wayland-protocols-next): New variable.

Change-Id: I3751d908f92463c7cb974eba25e3b9888e8238f7
Signed-off-by: John Kehayias <john@guixotic.coop>

gnu/packages/freedesktop.scm

@@ -1621,6 +1621,23 @@ protocol either in Wayland core, or some other protocol in wayland-protocols.")
     (home-page "https://wayland.freedesktop.org")
     (license license:expat)))
 
+;; TODO: Remove this package when wayland-protocols >= 1.45.
+;; This package is currently only used by hyprland.
+;; It will be removed on the next mesa-updates merge.
+(define-public wayland-protocols-next
+  (package/inherit wayland-protocols
+    (name "wayland-protocols")
+    (version "1.45")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://gitlab.freedesktop.org/wayland/wayland-protocols")
+                    (commit version)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1d2fv41vq75pvgkd3ykjypnp8zv0afv71p36cd91h19lbmwaia8h"))))))
+
 (define-public wayland-protocols-1.42
   (package
     (inherit wayland-protocols)