checkasm/vp8dsp: Use declare_func_emms only when needed

There is no MMX code for loop filters since commit
6a551f14050674fb685920eb1b0640810cacccf9, so use declare_func
instead of declare_func_emms() to also test that we are not
in MMX mode after return.

Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

tests/checkasm/vp8dsp.c

@@ -384,7 +384,7 @@ static void check_loopfilter_16y(void)
     VP8DSPContext d;
     int dir, edge, force_hev;
     int flim_E = 20, flim_I = 10, hev_thresh = 7;
-    declare_func_emms(AV_CPU_FLAG_MMX, void, uint8_t *, ptrdiff_t, int, int, int);
+    declare_func(void, uint8_t *, ptrdiff_t, int, int, int);
 
     ff_vp8dsp_init(&d);
 
@@ -430,7 +430,7 @@ static void check_loopfilter_8uv(void)
     VP8DSPContext d;
     int dir, edge, force_hev;
     int flim_E = 20, flim_I = 10, hev_thresh = 7;
-    declare_func_emms(AV_CPU_FLAG_MMX, void, uint8_t *, uint8_t *, ptrdiff_t, int, int, int);
+    declare_func(void, uint8_t *, uint8_t *, ptrdiff_t, int, int, int);
 
     ff_vp8dsp_init(&d);
 
@@ -481,7 +481,7 @@ static void check_loopfilter_simple(void)
     VP8DSPContext d;
     int dir;
     int flim_E = 20, flim_I = 30, hev_thresh = 0;
-    declare_func_emms(AV_CPU_FLAG_MMX, void, uint8_t *, ptrdiff_t, int);
+    declare_func(void, uint8_t *, ptrdiff_t, int);
 
     ff_vp8dsp_init(&d);