POWER build failure due to scv instruction

[Florian Weimer]

* Florian Weimer via Libc-alpha:

> Building libc-start.o fails on powerpc64le-linux-gnu with:
>
> …/csu/libc-start.s:623: Error: unrecognized opcode: `scv'
>
> And indeed this can be reproduced with:
>
>         .machine power8
>         .text
>         scv 0
>
> This seems to happen with only some binutils versions.  Specifically, I
> see it with 4100e6999664833defb8ee038f75812d9b85f9c7 from
> binutils-2_35-branch, but oddly enough not with Fedora's 2.35.1-21.fc34
> version, which is why I haven't reported this so far.

It's powerpc64-linux-gnu vs powerpc64le-linux-gnu.

Thanks,
Florian
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