Fix compile error on bfin.

After the removal of all Blackfin architecture optimizations in
http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b55d3bbeed375f7b74442c4dd274d116a3e3d2e1
some includes were left behind leading to a compile error:

CC      libavformat/adtsenc.o
In file included from ./libavcodec/get_bits.h:35,
                 from ./libavcodec/ac3_parser.h:27,
                 from libavformat/ac3dec.c:23:
./libavcodec/mathops.h:43:29: error: bfin/mathops.h: No such file or directory

This compile error was found by buildroot autobuild system:
http://autobuild.buildroot.net/results/ae0/ae056f267e907091d09d2a1546d6f1ae02fa23b9/Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mathops.h

@@ -39,8 +39,6 @@ extern const uint8_t ff_zigzag_direct[64];
 #   include "arm/mathops.h"
 #elif ARCH_AVR32
 #   include "avr32/mathops.h"
-#elif ARCH_BFIN
-#   include "bfin/mathops.h"
 #elif ARCH_MIPS
 #   include "mips/mathops.h"
 #elif ARCH_PPC

libavutil/bswap.h

@@ -40,8 +40,6 @@
 #   include "arm/bswap.h"
 #elif ARCH_AVR32
 #   include "avr32/bswap.h"
-#elif ARCH_BFIN
-#   include "bfin/bswap.h"
 #elif ARCH_SH4
 #   include "sh4/bswap.h"
 #elif ARCH_X86

libavutil/timer.h

@@ -40,8 +40,6 @@
 
 #if   ARCH_ARM
 #   include "arm/timer.h"
-#elif ARCH_BFIN
-#   include "bfin/timer.h"
 #elif ARCH_PPC
 #   include "ppc/timer.h"
 #elif ARCH_X86