[PATCH, BFD, AArch64] Define elf_backend_fixup_gnu_properties in AArch64

[Sudakshina Das]

Hi

This patch add support for elf_backend_fixup_gnu_properties for GNU 
property support for AArch64. The new AArch64 specific definition 
_bfd_aarch64_elf_link_fixup_gnu_properties goes through the property 
list to find AArch64 type properties and removes the properties that are 
marked as "property_remove" by moving the head of the list forward.

Builds and regression tested on aarch64-none-linux-gnu.

Is this ok for trunk?

Sudi

*** bfd/ChangeLog ***

2019-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* elfxx-aarch64.c (_bfd_aarch64_elf_link_fixup_gnu_properties):
Define.
	* elfxx-aarch64.h (_bfd_aarch64_elf_link_fixup_gnu_properties): Declare.
	(elf_backend_fixup_gnu_properties): Define for AArch64.

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