V2 [PATCH] as: Automatically enable DWARF5 support

[Florian Weimer]

* H. J. Lu via Binutils:

> Nick approved my patch at
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=27195#c7
>
> I am checking it in.  Is it OK to backport to 2.36 branch?

I think we need this on the 2.35 branch as well, otherwise glibc will
not enable --noexecstack on the architectures that need it, effectively
turning on an executable stack.  Maybe we also need to change the
configure check in glibc due to this bug.

Thanks,
Florian
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