dct-test: fix #if for ff_prores_idct_put_10_sse2()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/dct-test.c

@@ -99,7 +99,7 @@ static const struct algo fdct_tab[] = {
     { 0 }
 };
 
-#if HAVE_MMX && HAVE_YASM
+#if ARCH_X86_64 && HAVE_MMX && HAVE_YASM
 void ff_prores_idct_put_10_sse2(uint16_t *dst, int linesize,
                                 DCTELEM *block, int16_t *qmat);