scripts: always create lib32 and lib64 symlinks

Unconditionally create the lib32 -> lib/ and lib64 -> lib/ symlinks.

This is reportedly a fix to build a toolchain for a 32-bit target on
a 'pure' 64-bit host (eg. on Fedora FC12, host libs are in lib64/,
and there is no lib -> lib64 symlink, as we can see on other distors,
as Debian). As gcc only puts static host lib in lib64/ (along with
target files in subdirs), we can safely create the symlinks.

Also note that the symlinks are summarily removed at the end
of the build.

Signed-off-by: Anthony Foiani <anthony.foiani@gmail.com>
[Yann E. MORIN: fix a comment, rephrase the commit log]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

alpha does not have a __NR_creat

http://bugs.gentoo.org/227275

http://sourceware.org/bugzilla/show_bug.cgi?id=6650

diff -durN glibc-2.10.1.orig/sysdeps/unix/sysv/linux/wordsize-64/creat64.c glibc-2.10.1/sysdeps/unix/sysv/linux/wordsize-64/creat64.c

--- glibc-2.10.1.orig/sysdeps/unix/sysv/linux/wordsize-64/creat64.c	2007-11-10 20:34:26.000000000 +0100

+++ glibc-2.10.1/sysdeps/unix/sysv/linux/wordsize-64/creat64.c	2009-11-13 00:50:51.000000000 +0100

@@ -1 +1,5 @@

 /* Defined as alias for the syscall.  */

+#include <sysdep.h>

+#ifndef __NR_creat

+#include "../../../../../io/creat64.c"

+#endif