Use <> instead of "" for system headers.

Originally committed as revision 16480 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vdpau.h

@@ -44,8 +44,8 @@
  * @{
  */
 
-#include "vdpau/vdpau.h"
-#include "vdpau/vdpau_x11.h"
+#include <vdpau/vdpau.h>
+#include <vdpau/vdpau_x11.h>
 
 /** \brief The videoSurface is used for rendering. */
 #define FF_VDPAU_STATE_USED_FOR_RENDER 1