osutil.c: use strncpy instead of strncat

mercurial/osutil.c

@@ -197,7 +197,7 b' static PyObject *statfiles(PyObject *lis'
 		if (kind != -1 && !keep)
 			continue;
 
-		strncat(path + len + 1, name, PATH_MAX - len);
+		strncpy(path + len + 1, name, PATH_MAX - len);
 		path[PATH_MAX] = 0;
 
 		if (keep) {