Move sign macro to libavutil.

Originally committed as revision 6620 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/common.h

@@ -193,6 +193,7 @@ typedef uint64_t      uint_fast64_t;
 /* assume b>0 */
 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
 #define ABS(a) ((a) >= 0 ? (a) : (-(a)))
+#define SIGN(a) ((a) > 0 ? 1 : -1)
 
 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))

libpostproc/postprocess.c

@@ -101,7 +101,6 @@ try to unroll inner for(x=0 ... loop to avoid these damn if(x ... checks
 
 #define MIN(a,b) ((a) > (b) ? (b) : (a))
 #define MAX(a,b) ((a) < (b) ? (b) : (a))
-#define SIGN(a) ((a) > 0 ? 1 : -1)
 
 #define GET_MODE_BUFFER_SIZE 500
 #define OPTIONS_ARRAY_SIZE 10