avcodec/qsvenc: Remove unnecessary config_components.h inclusion

While just at it, also improve the other headers a bit.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/qsvenc.c

@@ -21,12 +21,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "config_components.h"
-
 #include <string.h>
 #include <sys/types.h>
 #include <mfxvideo.h>
 
+#include "libavutil/avassert.h"
 #include "libavutil/common.h"
 #include "libavutil/hwcontext.h"
 #include "libavutil/hwcontext_qsv.h"
@@ -34,7 +33,6 @@
 #include "libavutil/log.h"
 #include "libavutil/time.h"
 #include "libavutil/imgutils.h"
-#include "libavcodec/bytestream.h"
 
 #include "avcodec.h"
 #include "internal.h"