gnu: guile: Add version 2.2.3.

* gnu/packages/guile.scm (guile-2.2.3): New variable.

gnu/packages/guile.scm

@@ -221,7 +221,7 @@ without requiring the source code to be rewritten.")
 (define-public guile-2.2
   (package (inherit guile-2.0)
     (name "guile")
-    (version "2.2.2")
+    (version "2.2.2")                      ;TODO: Update to 2.2.3 (see below).
     (source (origin
               (method url-fetch)
 
@@ -251,6 +251,21 @@ without requiring the source code to be rewritten.")
             (files '("lib/guile/2.2/site-ccache"
                      "share/guile/site/2.2")))))))
 
+(define-public guile-2.2.3
+  ;; TODO: Make it the new 'guile-2.2' on the next rebuild cycle.
+  (package
+    (inherit guile-2.2)
+    (version "2.2.3")
+    (source (origin (inherit (package-source guile-2.2))
+                    (uri (list (string-append "mirror://gnu/guile/guile-"
+                                              version ".tar.xz")
+                               (string-append
+                                "https://wingolog.org/priv/guile-"
+                                version ".tar.xz")))
+                    (sha256
+                     (base32
+                      "11j01agvnci2cx32wwpqs9078856yxmvs15gcsz7ganpkj2ahlw3"))))))
+
 (define-public guile-2.2/fixed
   ;; A package of Guile 2.2 that's rarely changed.  It is the one used
   ;; in the `base' module, and thus changing it entails a full rebuild.