avcenc: support large source file
avcenc: support large source file

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
(cherry picked from commit 29ad40444f3ed68e5f54ddd70dd256ea41e0456f)

Conflicts:
	test/encode/avcenc.c

01org/iotg-lin-gfx-libva,chenxianqin/vaapi-libva,01org/iotg-lin-gfx-libva,01org/libva-cros,01org/libva-cros,01org/libva-cros,chenxianqin/vaapi-libva,01org/iotg-lin-gfx-libva,chenxianqin/vaapi-libva