linux(4): Add elf_hwcap2 to x86
On x86 Linux via AT_HWCAP2 the user controlled (by tunables) processor
capabilities are exposed.
Reviewed by:
Differential Revision: https://reviews.freebsd.org/D41165
MFC after: 2 weeks
linux(4): Add elf_hwcap2 to x86 Tags None Referenced Files None Subscribers None
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