selftests: arm64: mte: check_prctl.c:72:17: error: use of undeclared identifier 'AT_HWCAP3'

[Mark Brown]

On Tue, Jul 15, 2025 at 04:53:04PM +0530, Naresh Kamboju wrote:
> The selftests arm64 mte build failed on the Linux next-20250703 onwards
> with clang-20 toolchain. still seen on today's tag next-20250714.

I have a bodge for this which I see I didn't get round to sending out
last week while I was at an internal conference.
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