gst1-vaapi: fix build when Gstreamer debugging is disabled

gst1-vaapi: fix build when Gstreamer debugging is disabled

When Gstreamer debugging is disabled (BR2_PACKAGE_GSTREAMER1_GST_DEBUG)
we get following build errors:

  gstvaapisink.c: In function 'gst_vaapisink_init':
  gstvaapisink.c:1902:39: error: 'gst_debug_vaapisink' undeclared (first use in this function)
  gstvaapisink.c:1902:39: note: each undeclared identifier is reported only once for each function it appears in
  gstvaapidecode.c: In function 'gst_vaapidecode_init':
  gstvaapidecode.c:1365:63: error: 'gst_debug_vaapidecode' undeclared (first use in this function)
  gstvaapidecode.c:1365:63: note: each undeclared identifier is reported only once for each function it appears in
  gstvaapipostproc.c: In function 'gst_vaapipostproc_init':
  gstvaapipostproc.c:1811:7: error: 'gst_debug_vaapipostproc' undeclared (first use in this function)
  gstvaapipostproc.c:1811:7: note: each undeclared identifier is reported only once for each function it appears in

Add upstream patch to fix these build issues.

Fixes:
  http://autobuild.buildroot.net/results/653/653d9b056b04e589b8f5c57111635b0b3d7c8949

Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>