avformat/codec2: remove surplus include 'memory.h' statement

on glibc memory.h drags in string.h, but codec2 does not use any
str* or mem* functions. additionally, memory.h is not part of the
C99 or POSIX standards.

Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/codec2.c

@@ -21,7 +21,6 @@
 
 #include "config_components.h"
 
-#include <memory.h>
 #include "libavcodec/codec2utils.h"
 #include "libavutil/channel_layout.h"
 #include "libavutil/intreadwrite.h"