lz4: add memmove to arm string.c

common/lz4/lz4.c

@@ -182,26 +182,6 @@
 #include <string.h>   /* memset, memcpy */
 #define MEM_INIT(p,v,s)   memset((p),(v),(s))
 
-#ifdef NEED_MEMMOVE
-void *
-memmove (void *dest, const void *src, size_t len)
-{
-  char *d = dest;
-  const char *s = src;
-  if (d < s)
-    while (len--)
-      *d++ = *s++;
-  else
-    {
-      char *lasts = (char*)s + (len-1);
-      char *lastd = d + (len-1);
-      while (len--)
-        *lastd-- = *lasts--;
-    }
-  return dest;
-}
-#endif
-
 /*-************************************
 *  Common Constants
 **************************************/