avcodec: Remove unnecessary fft, dct inclusions

Also remove some internal.h inclusions which have been
unnecessarily added recently.

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

libavcodec/ac3enc.c

@@ -48,7 +48,6 @@
 #include "ac3.h"
 #include "ac3defs.h"
 #include "ac3tab.h"
-#include "fft.h"
 #include "ac3enc.h"
 #include "eac3enc.h"
 

libavcodec/ac3enc_fixed.c

@@ -27,7 +27,6 @@
  */
 
 #define AC3ENC_FLOAT 0
-#include "internal.h"
 #include "audiodsp.h"
 #include "ac3enc.h"
 #include "codec_internal.h"

libavcodec/atrac3plusdsp.c

@@ -31,9 +31,7 @@
 #include "libavutil/libm.h"
 #include "libavutil/mem_internal.h"
 
-#include "avcodec.h"
 #include "sinewin.h"
-#include "fft.h"
 #include "atrac3plus.h"
 
 /**

libavcodec/proresenc_anatoliy.c

@@ -31,7 +31,6 @@
 #include "libavutil/opt.h"
 #include "avcodec.h"
 #include "codec_internal.h"
-#include "dct.h"
 #include "encode.h"
 #include "internal.h"
 #include "profiles.h"

libavcodec/synth_filter.c

@@ -19,7 +19,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "fft.h"
 #include "dcadct.h"
 #include "dcamath.h"
 #include "synth_filter.h"

libavcodec/twinvq.c

@@ -26,7 +26,6 @@
 #include "libavutil/float_dsp.h"
 #include "avcodec.h"
 #include "decode.h"
-#include "fft.h"
 #include "lsp.h"
 #include "metasound_twinvq_data.h"
 #include "sinewin.h"

libavcodec/twinvq.h

@@ -30,7 +30,6 @@
 #include "libavutil/common.h"
 #include "libavutil/float_dsp.h"
 #include "avcodec.h"
-#include "internal.h"
 
 enum TwinVQCodec {
     TWINVQ_CODEC_VQF,