Adapting postproc example to use new file reading API.

Change-Id: Ib3747c81db8cc89b5d7012db557411a3b49712aa
diff --git a/examples.mk b/examples.mk
index 6940353..57a028a 100644
--- a/examples.mk
+++ b/examples.mk
@@ -79,6 +79,8 @@
 simple_decoder.SRCS                += tools_common.h tools_common.c
 simple_decoder.DESCRIPTION         = Simplified decoder loop
 GEN_EXAMPLES-$(CONFIG_VP8_DECODER) += postproc.c
+postproc.SRCS                      += ivfdec.h ivfdec.c
+postproc.SRCS                      += tools_common.h tools_common.c
 postproc.GUID                    = 65E33355-F35E-4088-884D-3FD4905881D7
 postproc.DESCRIPTION             = Decoder postprocessor control
 GEN_EXAMPLES-$(CONFIG_VP8_DECODER) += decode_to_md5.c