gnu: rust-gio-sys: Add 0.15.10.

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

gnu/packages/crates-gtk.scm

@@ -897,8 +897,51 @@ (define-public rust-gio-0.7
        #:cargo-development-inputs
        (("rust-gir-format-check" ,rust-gir-format-check-0.1))))))
 
+(define-public rust-gio-sys-0.15
+  (package
+    (name "rust-gio-sys")
+    (version "0.15.10")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "gio-sys" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "13fgmc2xdzg9qk9l3nlp1bilwn6466mrqbiq4fhc9qkia93pl59j"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(;; FIXME: some GLib macros are not found
+       #:tests? #f
+       #:cargo-inputs
+       (("rust-glib-sys" ,rust-glib-sys-0.15)
+        ("rust-gobject-sys" ,rust-gobject-sys-0.15)
+        ("rust-libc" ,rust-libc-0.2)
+        ("rust-system-deps" ,rust-system-deps-6)
+        ("rust-winapi" ,rust-winapi-0.3))
+       #:cargo-development-inputs
+       (("rust-shell-words" ,rust-shell-words-1)
+        ("rust-tempfile" ,rust-tempfile-3))
+       #:phases (modify-phases %standard-phases
+                  (add-before 'check 'extend-include-path
+                    (lambda* (#:key inputs #:allow-other-keys)
+                      (let ((gio-headers (search-input-directory
+                                          inputs "include/gio-unix-2.0")))
+                        ;; Tests rely on these headers.
+                        (setenv "C_INCLUDE_PATH"
+                                (string-append gio-headers ":"
+                                               (getenv "C_INCLUDE_PATH")))))))))
+    (native-inputs
+     (list pkg-config))
+    (inputs
+     (list glib))
+    (home-page "https://gtk-rs.org/")
+    (synopsis "FFI bindings to libgio-2.0")
+    (description "This package provides FFI bindings to libgio-2.0.")
+    (license license:expat)))
+
 (define-public rust-gio-sys-0.14
   (package
+    (inherit rust-gio-sys-0.15)
     (name "rust-gio-sys")
     (version "0.14.0")
     (source
@@ -917,13 +960,7 @@ (define-public rust-gio-sys-0.14
         ("rust-gobject-sys" ,rust-gobject-sys-0.14)
         ("rust-libc" ,rust-libc-0.2)
         ("rust-system-deps" ,rust-system-deps-3)
-        ("rust-winapi" ,rust-winapi-0.3))))
-    (inputs
-     (list glib))
-    (home-page "https://gtk-rs.org/")
-    (synopsis "FFI bindings to libgio-2.0")
-    (description "This package provides FFI bindings to libgio-2.0.")
-    (license license:expat)))
+        ("rust-winapi" ,rust-winapi-0.3))))))
 
 (define-public rust-gio-sys-0.10
   (package