add select for s390 (using _newselect)

--- ../../dietlibc/s390/select.S	1970-01-01 00:00:00.000000000 +0000
+++ s390/select.S	2005-03-23 19:57:53.000000000 +0000
@@ -0,0 +1,3 @@
+#include "syscalls.h"
+
+syscall(_newselect,select)