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aarch64: enable PAC/BTI

Daiki Ueno requested to merge ueno/nettle:wip/pacbti2 into master

This supersedes !65 (closed) based on @wcrobertarm's code hosted on https://github.com/billatarm/nettle/pull/1. Major changes are:

  • Move .note.gnu.property section generation to machine.m4, with a helper M4 macro GNU_PROPERTY_NOTE, shared with Intel CET support
  • Define PROLOGUE with support for BTI to machine.m4, in a similar manner to PowerPC support
  • Print configure status of PAC/BTI detection with AC_CACHE_CHECK

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