rhythmbox: fix build with GStreamer 1.14

pkgs/applications/audio/rhythmbox/default.nix

···
     sha256 = "0hzcns8gf5yb0rm4ss8jd8qzarcaplp5cylk6plwilsqfvxj4xn2";
   };
 
+  patches = [
+    # build with GStreamer 1.14 https://bugzilla.gnome.org/show_bug.cgi?id=788706
+    (fetchurl {
+      name = "fmradio-Fix-build-with-GStreamer-master.patch";
+      url = https://bugzilla.gnome.org/attachment.cgi?id=361178;
+      sha256 = "1h09mimlglj9hcmc3pfp0d6c277mqh2khwv9fryk43pkv3904d2w";
+    })
+  ];
+
   nativeBuildInputs = [
     pkgconfig
     intltool perl perlPackages.XMLParser