x86: Properly add X86_ISA_1_NEEDED property

x86: Properly add X86_ISA_1_NEEDED property

Existing properties may be removed during property merging.  We avoid
adding X86_ISA_1_NEEDED property only if existing properties won't be
removed.

bfd/

	PR ld/23428
	* elfxx-x86.c (_bfd_x86_elf_link_setup_gnu_properties): Don't
	add X86_ISA_1_NEEDED property only if existing properties won't
	be removed.

ld/

	PR ld/23428
	* testsuite/ld-elf/dummy.s: New file.
	* testsuite/ld-elf/linux-x86.S: Add X86_FEATURE_1_AND property.
	* testsuite/ld-elf/linux-x86.exp: Add dummy.s to pr23428.