gnu: rust-pango: Add 0.15.10.

* gnu/packages/crates-gtk.scm (rust-pango-0.15): New variable.
(rust-pango-0.14): Inherit from it.

gnu/packages/crates-gtk.scm

@@ -1645,8 +1645,41 @@
 library.")
     (license license:expat)))
 
+(define-public rust-pango-0.15
+  (package
+    (name "rust-pango")
+    (version "0.15.10")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "pango" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0ksf85fqkw4y5pf21p84g5xn4fnqn21cbrmx2d9yx6k591ah9r12"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(;; FIXME: error[E0277]: `Errors` doesn't implement `std::fmt::Display`
+       #:tests? #f
+       #:cargo-inputs
+       (("rust-bitflags" ,rust-bitflags-1)
+        ("rust-glib" ,rust-glib-0.15)
+        ("rust-libc" ,rust-libc-0.2)
+        ("rust-once-cell" ,rust-once-cell-1)
+        ("rust-pango-sys" ,rust-pango-sys-0.15))
+       #:cargo-development-inputs
+       (("rust-gir-format-check" ,rust-gir-format-check-0.1))))
+    (native-inputs
+     (list pkg-config))
+    (inputs
+     (list pango))
+    (home-page "https://gtk-rs.org/")
+    (synopsis "Rust bindings for the Pango library")
+    (description "Rust bindings for the Pango library")
+    (license license:expat)))
+
 (define-public rust-pango-0.14
   (package
+    (inherit rust-pango-0.15)
     (name "rust-pango")
     (version "0.14.8")
     (source
@@ -1667,13 +1700,7 @@ library.")
         ("rust-once-cell" ,rust-once-cell-1)
         ("rust-pango-sys" ,rust-pango-sys-0.14))
        #:cargo-development-inputs
-       (("rust-gir-format-check" ,rust-gir-format-check-0.1))))
+       (("rust-gir-format-check" ,rust-gir-format-check-0.1))))))
-    (inputs
-     (list pango))
-    (home-page "https://gtk-rs.org/")
-    (synopsis "Rust bindings for the Pango library")
-    (description "Rust bindings for the Pango library")
-    (license license:expat)))
 
 (define-public rust-pango-0.9
   (package