scripts/functions: force extract folder to archive basename

Some archives like those of the 2011.07 revisions of Linaro GCC contain a folder
name different from the archive basename, which leads to errors afterwards, e.g.
when patching. E.g.:
gcc-linaro-4.5-2011.07.tar.bz2 extracts to gcc-linaro-4.5-2011.07-0/

This patch changes CT_Extract() to force the extraction of all archives to a
folder named like the archive basename. E.g.:
gcc-linaro-4.5-2011.07.tar.bz2 now extracts to gcc-linaro-4.5-2011.07/

Signed-off-by: "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>

 --- glibc-2.6/sysdeps/unix/sysv/linux/kernel-features.h	2006-07-29 07:43:27.000000000 +0300

 +++ glibc-2.6/sysdeps/unix/sysv/linux/kernel-features.h.new	2008-07-26 08:45:06.000000000 +0300

 @@ -445,7 +445,7 @@

  /* The *at syscalls were introduced just after 2.6.16-rc1.  Due to the way the

     kernel versions are advertised we can only rely on 2.6.17 to have

     the code.  */

 -#if __LINUX_KERNEL_VERSION >= 0x020611

 +#if __LINUX_KERNEL_VERSION >= 0x020611 && !defined __alpha__

  # define __ASSUME_ATFCTS	1

  #endif