hevc/sao: use unaligned copy

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

libavcodec/hevc_filter.c

@@ -147,7 +147,7 @@ int i, j;
     if (((intptr_t)dst | (intptr_t)src | stride_dst | stride_src) & 15) {
         for (i = 0; i < height; i++) {
             for (j = 0; j < width; j+=8)
-                AV_COPY64(dst+j, src+j);
+                AV_COPY64U(dst+j, src+j);
             dst += stride_dst;
             src += stride_src;
         }