x86: Remove empty X86_FEATURE_1_AND property

x86: Remove empty X86_FEATURE_1_AND property

There is no need to generate .note.gnu.property section with empty
X86_FEATURE_1_AND property.  This patch adds fixup_gnu_properties
to ELF linker backend so that x86 backend can remove it.

bfd/

	PR ld/23515
	* elf-bfd.h (elf_backend_data): Add fixup_gnu_properties.
	* elf-properties.c (_bfd_elf_link_setup_gnu_properties): Call
	backend fixup_gnu_properties if it isn't NULL.  Discard
	.note.gnu.property section if all properties have been removed.
	* elfxx-target.h (elf_backend_fixup_gnu_properties): New.
	(elfNN_bed): Initialize fixup_gnu_properties.
	* elfxx-x86.c (_bfd_x86_elf_link_fixup_gnu_properties): New
	function.
	* elfxx-x86.h (_bfd_x86_elf_link_fixup_gnu_properties): New
	prototype.
	(elf_backend_fixup_gnu_properties): New.

ld/

	PR ld/23515
	* testsuite/ld-i386/ibt-plt-2a.d: Updated.
	* testsuite/ld-i386/ibt-plt-2b.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2a-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2a.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2b-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2b.d: Likewise.