gst-validate: init at 1.6.0

pitivi-0.95 requires this. (I added iyzsong as maintainer, in line with
the other gstreamer packages.)

pkgs/development/libraries/gstreamer/validate/default.nix

@@ -0,0 +1,33 @@
+{ stdenv, fetchurl, pkgconfig, gstreamer, gst-plugins-base
+, python, gobjectIntrospection
+}:
+
+stdenv.mkDerivation rec {
+  name = "gst-validate-1.6.0";
+
+  meta = {
+    description = "Integration testing infrastructure for the GStreamer framework";
+    homepage = "http://gstreamer.freedesktop.org";
+    license = stdenv.lib.licenses.lgpl2Plus;
+    platforms = stdenv.lib.platforms.unix;
+    maintainers = with stdenv.lib.maintainers; [ iyzsong ];
+  };
+
+  src = fetchurl {
+    url = "${meta.homepage}/src/gst-validate/${name}.tar.xz";
+    sha256 = "1vmg5mh068zrvhgrjsbnb7y4k632akyhm8ql0g196cinnp3zibiv";
+  };
+
+  nativeBuildInputs = [
+    pkgconfig gobjectIntrospection
+  ];
+
+  buildInputs = [
+    python
+  ];
+
+  propagatedBuildInputs = [ gstreamer gst-plugins-base ];
+
+  enableParallelBuilding = true;
+}
+