fix config.guess for FreeBSD aarch64

[Mikaël Urankar]

Hi,

I made a mistake when I submitted [1].

On FreeBSD aarch64, UNAME_MACHINE is arm64 and config.guess thinks it's an armv6 or armv7 platform.

The attached patch fixes the issue.

Thanks in advance.

[1] http://git.savannah.gnu.org/cgit/config.git/commit/?id=afe1fa96bf32291d51fe337902ab8a2af176fe8d

config_guess.patch
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