Tidy elf_symbol_from

bfd/
	* elf-bfd.h (elf_symbol_from): Remove unused ABFD parameter.
	* elf.c (ignore_section_sym, _bfd_elf_copy_private_symbol_data),
	(swap_out_syms): Adjust elf_symbol_from invocation.
binutils/
	* nm.c (print_symbol): Adjust elf_symbol_from invocation.
	* objcopy.c (is_hidden_symbol): Likewise.
gas/
	* config/obj-elf.c (obj_elf_visibility, elf_frob_symbol): Adjust
	elf_symbol_from invocation.
	* config/tc-aarch64.c (s_variant_pcs): Likewise.
	* config/tc-m68hc11.c (s_m68hc11_mark_symbol): Likewise.
	* config/tc-ppc.c (ppc_elf_localentry, ppc_force_relocation),
	(ppc_fix_adjustable): Likewise.
	* config/tc-xgate.c (xgate_frob_symbol): Likewise.
ld/
	* plugin.c (asymbol_from_plugin_symbol): Adjust elf_symbol_from
	invocation.
opcodes/
	* ppc-dis.c (ppc_symbol_is_valid): Adjust elf_symbol_from invocation.