[Patch, AArch64] Set libgloss_dir for aarch64*-*-* targets

[Yufeng Zhang]

Hi,

This patch updates the top-level configuration files to explicitly set 
libgloss_dir to aarch64 for aarch64*-*-* targets.

OK to commit?

Thanks,
Yufeng

2013-01-10  Yufeng Zhang  <yufeng.zhang@arm.com>

         * configure.ac: Set libgloss_dir for the aarch64*-*-* targets.
         * configure: Regenerated.
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