motion_est: remove unused macros

Signed-off-by: NMans Rullgard <mans@mansr.com>

libavcodec/motion_est.c

@@ -39,8 +39,6 @@
 #undef NDEBUG
 #include <assert.h>
 
-#define SQ(a) ((a)*(a))
-
 #define P_LEFT P[1]
 #define P_TOP P[2]
 #define P_TOPRIGHT P[3]
@@ -374,8 +372,6 @@ int ff_init_me(MpegEncContext *s){
     return 0;
 }
 
-#define Z_THRESHOLD 256
-
 #define CHECK_SAD_HALF_MV(suffix, x, y) \
 {\
     d= s->dsp.pix_abs[size][(x?1:0)+(y?2:0)](NULL, pix, ptr+((x)>>1), stride, h);\