gnu: rust-wayland-client: Add 0.29.4.

* gnu/packages/crates-graphics.scm (rust-wayland-client-0.29): New variable.
(rust-wayland-client-0.28): Inherit from it.

gnu/packages/crates-graphics.scm

@@ -2406,8 +2406,50 @@ (define-public rust-tiff-0.2
         ("rust-num-derive" ,rust-num-derive-0.2)
         ("rust-num-traits" ,rust-num-traits-0.2))))))
 
+(define-public rust-wayland-client-0.29
+  (package
+    (name "rust-wayland-client")
+    (version "0.29.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "wayland-client" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "13s5sj9344izk2g48yizk81kcg8jg4940gg2v6bzcmrjwxh388li"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:tests? #false               ;circular dependency on wayland-protocols
+       #:cargo-inputs
+       (("rust-bitflags" ,rust-bitflags-1)
+        ("rust-downcast-rs" ,rust-downcast-rs-1)
+        ("rust-libc" ,rust-libc-0.2)
+        ("rust-nix" ,rust-nix-0.22)
+        ("rust-scoped-tls" ,rust-scoped-tls-1)
+        ("rust-wayland-commons" ,rust-wayland-commons-0.29)
+        ("rust-wayland-scanner" ,rust-wayland-scanner-0.29))
+       #:cargo-development-inputs
+       (("rust-tempfile" ,rust-tempfile-3))))
+    (inputs
+     (list rust-bitflags-1
+           rust-downcast-rs-1
+           rust-libc-0.2
+           rust-nix-0.22
+           rust-scoped-tls-1
+           rust-wayland-commons-0.29
+           rust-wayland-scanner-0.29
+           rust-wayland-sys-0.29))
+    (home-page "https://github.com/smithay/wayland-rs")
+    (synopsis
+     "Rust bindings to the standard C implementation of the wayland protocol")
+    (description
+     "This package provides Rust bindings to the standard C implementation of
+the wayland protocol, client side.")
+    (license license:expat)))
+
 (define-public rust-wayland-client-0.28
   (package
+    (inherit rust-wayland-client-0.29)
     (name "rust-wayland-client")
     (version "0.28.3")
     (source
@@ -2435,14 +2477,7 @@ (define-public rust-wayland-client-0.28
            rust-scoped-tls-1
            rust-wayland-commons-0.28
            rust-wayland-scanner-0.28
-           rust-wayland-sys-0.28))
-    (home-page "https://github.com/smithay/wayland-rs")
-    (synopsis
-     "Rust bindings to the standard C implementation of the wayland protocol")
-    (description
-     "This package provides Rust bindings to the standard C implementation of
-the wayland protocol, client side.")
-    (license license:expat)))
+           rust-wayland-sys-0.28))))
 
 (define-public rust-wayland-client-0.23
   (package