gnu: gtk+: Graft to 3.24.51.

* gnu/packages/gtk.scm (gtk+): Add replacement with gtk+/fixed.
(gtk+/fixed): New variable.

Fixes: #3068
Change-Id: I47e082e713c4072e96c16df0b55151e93f8f07e0
Signed-off-by: Maxim Cournoyer <maxim@guixotic.coop>

gnu/packages/gtk.scm

@@ -1008,6 +1008,7 @@ application suites.")
 (define-public gtk+
   (package
     (inherit gtk+-2)
+    (replacement gtk+/fixed)
     (name "gtk+")
     (version "3.24.49")
     (source (origin
@@ -1139,6 +1140,23 @@ application suites.")
             (variable "GUIX_GTK3_PATH")
             (files '("lib/gtk-3.0")))))))
 
+(define-public gtk+/fixed
+  (let* ((base gtk+)
+         (source (package-source base)))
+    (package
+      (inherit base)
+      (version "3.24.51")
+      (source
+       (origin
+         (inherit source)
+         (uri (git-reference
+                (inherit (origin-uri source))
+                (commit version)))
+         (file-name (git-file-name (package-name base) version))
+         (sha256
+          (base32
+           "07vw0rani9d65px36fzzj7sprv5r48shyjdgzipkihzqaldd98yh")))))))
+
 (define-public gtk
   (package
     (name "gtk")