[PATCH, AArch64] Detect assembler vector mov parsing bug

[Richard Henderson <rth at twiddle dot net>]

The strchr implementation that was recently committed to mainline tickles an
assembler bug fixed by

commit 8db49cc2de52033990ae5d4d6aacedc8f986e803
Author: Will Newton <will.newton@linaro.org>
Date:   Thu Oct 31 17:21:11 2013 -0700

    config/tc-aarch64.c: Avoid trying to parse a vector mov as immediate.
    ...

Obviously not a problem with a relatively new binutils installed, but Carlos
ran into this problem building mainline glibc on a system using binutils 2.23.

It's not a silent error (we die linking ld.so), but its somewhat cryptic.
Carlos opined to me that we ought to error out at configure time with an
understandable message.

Rather than check for version numbers, let's check for functionality.

Ok?


r~

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