remove more void* arithmetic

byte/byte_copyr.c

@@ -3,7 +3,7 @@
 /* byte_copyr copies in[len-1] to out[len-1], in[len-2] to out[len-2],
  * ... and in[0] to out[0] */
 void byte_copyr(void* out, unsigned int len, const void* in) {
-  register char* s=out+len;
+  register char* s=(char*)out+len;
   register const char* t=in;
   register const char* u=t+len;
   for (;;) {