Replace many includes of libavutil/common.h with what is actually needed

This reduces the number of false dependencies on header files and
speeds up compilation.

Originally committed as revision 22407 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/x86/bswap.h

@@ -26,7 +26,7 @@
 
 #include <stdint.h>
 #include "config.h"
-#include "libavutil/common.h"
+#include "libavutil/attributes.h"
 
 #define bswap_16 bswap_16
 static av_always_inline av_const uint16_t bswap_16(uint16_t x)

libavutil/x86/intmath.h

@@ -21,8 +21,6 @@
 #ifndef AVUTIL_X86_INTMATH_H
 #define AVUTIL_X86_INTMATH_H
 
-#include "libavutil/common.h"
-
 #define FASTDIV(a,b) \
     ({\
         int ret, dmy;\

libavutil/x86/intreadwrite.h

@@ -23,7 +23,7 @@
 
 #include <stdint.h>
 #include "config.h"
-#include "libavutil/common.h"
+#include "libavutil/attributes.h"
 
 #if HAVE_MMX