lavc: define STRIDE_ALIGN as 32 when compiling with AVX support

Signed-off-by: James Almer <jamrial@gmail.com>
Reviewed-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/internal.h

@@ -35,7 +35,9 @@
 
 #define FF_SANE_NB_CHANNELS 63U
 
-#if HAVE_NEON || ARCH_PPC || HAVE_MMX
+#if HAVE_AVX
+#   define STRIDE_ALIGN 32
+#elif HAVE_NEON || ARCH_PPC || HAVE_MMX
 #   define STRIDE_ALIGN 16
 #else
 #   define STRIDE_ALIGN 8