grilo: add darwin support

pkgs/development/libraries/gom/default.nix

···
     description = "A GObject to SQLite object mapper";
     homepage = "https://wiki.gnome.org/Projects/Gom";
     license = licenses.lgpl21Plus;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
     maintainers = teams.gnome.members;
   };
 }

pkgs/development/libraries/grilo-plugins/default.nix

···
     description = "A collection of plugins for the Grilo framework";
     maintainers = teams.gnome.members;
     license = licenses.lgpl21Plus;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }

pkgs/development/libraries/grilo/default.nix

···
 { stdenv
 , lib
 , fetchurl
+, fetchpatch
 , meson
 , mesonEmulatorHook
 , ninja
···
     url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
     sha256 = "81Ks9zZlZpk0JwY2/t5mtS2mgB/iD2OMQEirJnhXey0=";
   };
+
+  patches = [
+    (fetchpatch {
+      url = "https://gitlab.gnome.org/GNOME/grilo/-/commit/b0d75be00b06cb0163dabbedecf9122a55273349.patch";
+      sha256 = "sha256-Hwnc3TLN6n3w/MAFcprHv7nbTcwRfI0cmfDriNLnAvQ=";
+    })
+  ];
 
   mesonFlags = [
     "-Denable-gtk-doc=true"
···
     description = "Framework that provides access to various sources of multimedia content, using a pluggable system";
     maintainers = teams.gnome.members;
     license = licenses.lgpl2Plus;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }

pkgs/development/libraries/libmediaart/default.nix

···
     description = "Library tasked with managing, extracting and handling media art caches";
     maintainers = teams.gnome.members;
     license = licenses.gpl2;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }