oggdemux: Move seeking in pull mode to the streaming thread

Flushing and teering down the streaming thread from the seeking thread and simply letting the streaming thread handle the seek event in its loop function.

Fixes #639 (closed)

m4/gst-gl.m4

@@ -744,6 +744,7 @@ GST_GL_HAVE_WINDOW_DISPMANX=0
 GST_GL_HAVE_WINDOW_EAGL=0
 GST_GL_HAVE_WINDOW_VIV_FB=0
 GST_GL_HAVE_WINDOW_GBM=0
+GST_GL_HAVE_WINDOW_WINRT=0
 
 if test "x$HAVE_WINDOW_X11" = "xyes"; then
   GL_WINDOWS="x11 $GL_WINDOWS"
@@ -792,6 +793,7 @@ GL_CONFIG_DEFINES="$GL_CONFIG_DEFINES
 #define GST_GL_HAVE_WINDOW_EAGL $GST_GL_HAVE_WINDOW_EAGL
 #define GST_GL_HAVE_WINDOW_VIV_FB $GST_GL_HAVE_WINDOW_VIV_FB
 #define GST_GL_HAVE_WINDOW_GBM $GST_GL_HAVE_WINDOW_GBM
+#define GST_GL_HAVE_WINDOW_WINRT $GST_GL_HAVE_WINDOW_WINRT
 "
 
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