avformat/mpegvideo_enc: Move sponsorship notice to its own comment block

Suggested-by: BBB
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/mpegvideo_enc.c

@@ -20,7 +20,9 @@
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
+ */
+
+/*
  * non linear quantizers with large QPs and VBV with restrictive qmin fixes sponsored by NOA GmbH
  */