snow: remove unused stub functions

w53_32_c() and w97_32_c() are defined as stubs when snow encoder is
disabled.  In this case, those functions are not referenced at all
and do thus not need to be defined.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22448 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/snow.h

@@ -128,9 +128,6 @@ void ff_snow_inner_add_yblock(const uint8_t *obmc, const int obmc_stride, uint8_
 #if CONFIG_SNOW_ENCODER
 int w53_32_c(void *v, uint8_t * pix1, uint8_t * pix2, int line_size, int h);
 int w97_32_c(void *v, uint8_t * pix1, uint8_t * pix2, int line_size, int h);
-#else
-static int w53_32_c(void *v, uint8_t * pix1, uint8_t * pix2, int line_size, int h) {assert (0); return 0;}
-static int w97_32_c(void *v, uint8_t * pix1, uint8_t * pix2, int line_size, int h) {assert (0); return 0;}
 #endif
 
 void ff_spatial_dwt(int *buffer, int width, int height, int stride, int type, int decomposition_count);