adding interfaces.h

Original commit message from CVS:
adding interfaces.h

gst-libs/gst/interfaces/interfaces.h

+/* GStreamer Interfaces
+ * Copyright (C) 2005 Thomas Vander Stichele <thomas at apestaart dot org>
+ *
+ * interfaces.h: include for all interfaces
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_INTERFACES_H__
+#define __GST_INTERFACES_H__
+
+#include "colorbalance.h"
+#include "mixer.h"
+#include "navigation.h"
+#include "propertyprobe.h"
+#include "tuner.h"
+#include "xoverlay.h"
+
+#endif /* __GST_INTERFACES_H__ */