swscale/utils: Allow sws_setColorspaceDetails() to use the tables from sws_getColorspaceDetails()

Previously this would have lead to a memcpy(a,a) which violates the
requirement of non overlapping src and dst.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswscale/utils.c

@@ -960,8 +960,8 @@ int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
 {
     const AVPixFmtDescriptor *desc_dst;
     const AVPixFmtDescriptor *desc_src;
-    memcpy(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
-    memcpy(c->dstColorspaceTable, table, sizeof(int) * 4);
+    memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
+    memmove(c->dstColorspaceTable, table, sizeof(int) * 4);
 
     handle_formats(c);
     desc_dst = av_pix_fmt_desc_get(c->dstFormat);