ld/

	* emulparams/aarch64elf.sh: Define ELFSIZE=64.
	* emulparams/aarch64linux.sh: Ditto.
	* emultempl/aarch64elf.em (aarch64_elf_before_allocation):
	Replace elf64 with elf${ELFSIZE}.
	(elf64_aarch64_add_stub_section): Likewise.
	(build_section_lists): Likewise.
	(gld${EMULATION_NAME}_after_allocation): Likewise.
	(gld${EMULATION_NAME}_finish): Likewise.
	(aarch64_elf_create_output_section_statements): Likewise.
	* faq-programming.xml (faq.programming.64bitporting): Mention the
	-Wformat and -Wall gcc options.