svq1enc: remove stale altivec-related hack

altivec.h is no longer (indirectly) included, so this hack is not
needed.
Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/svq1enc.c

@@ -113,10 +113,6 @@ static void svq1_write_header(SVQ1Context *s, int frame_type)
 #define QUALITY_THRESHOLD 100
 #define THRESHOLD_MULTIPLIER 0.6
 
-#if HAVE_ALTIVEC
-#undef vector
-#endif
-
 static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref, uint8_t *decoded, int stride, int level, int threshold, int lambda, int intra){
     int count, y, x, i, j, split, best_mean, best_score, best_count;
     int best_vector[6];