Fix potentially undefined behaviour use of strcpcy.

* pe-dll.c (pe_find_cdecl_alias_match): Use memmove to overwrite
	lname string.

ld/pe-dll.c

@@ -3039,7 +3039,9 @@ pe_find_cdecl_alias_match (struct bfd_link_info *linfo, char *name)
 	  if (pe_details->underscored)
 	    lname[0] = '_';
 	  else
-	    strcpy (lname, lname + 1);
+	    /* Use memmove rather than strcpy as that
+	       can handle overlapping buffers.  */
+	    memmove (lname, lname + 1, strlen (lname));
 	  key.key = lname;
 	  kv = bsearch (&key, udef_table, undef_count,
 			sizeof (struct key_value), undef_sort_cmp);