vaapi: Fix -Wimplicit-function-declaration for ff_dlog() usage

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/vaapi_mpeg2.c

@@ -22,6 +22,7 @@
 
 #include "mpegutils.h"
 #include "vaapi_internal.h"
+#include "internal.h"
 
 /** Reconstruct bitstream f_code */
 static inline int mpeg2_get_f_code(MpegEncContext *s)

libavcodec/vaapi_mpeg4.c

@@ -21,6 +21,7 @@
  */
 
 #include "vaapi_internal.h"
+#include "internal.h"
 #include "h263.h"
 #include "mpeg4video.h"
 

libavcodec/vaapi_vc1.c

@@ -21,6 +21,7 @@
  */
 
 #include "vaapi_internal.h"
+#include "internal.h"
 #include "vc1.h"
 #include "vc1data.h"