tests/checkasm/llvidencdsp: Don't use declare_func_emms

Only sub_media_pred has an MMXEXT version, so one can use
the version with the stricter check (that checks that
the MMX registers have not been clobbered) for sub_left_predict.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

tests/checkasm/llviddspenc.c

@@ -81,8 +81,8 @@ static void check_sub_left_pred(LLVidEncDSPContext *c)
     LOCAL_ALIGNED_32(uint8_t, src0, [MAX_STRIDE * MAX_HEIGHT]);
     LOCAL_ALIGNED_32(uint8_t, src1, [MAX_STRIDE * MAX_HEIGHT]);
 
-    declare_func_emms(AV_CPU_FLAG_MMX, void, uint8_t *dst, const uint8_t *src,
-                      ptrdiff_t stride, ptrdiff_t width, int height);
+    declare_func(void, uint8_t *dst, const uint8_t *src,
+                 ptrdiff_t stride, ptrdiff_t width, int height);
 
     memset(dst0, 0, MAX_STRIDE * MAX_HEIGHT);
     memset(dst1, 0, MAX_STRIDE * MAX_HEIGHT);