Parameterize elf32-i386 PLT generation:

Parameterize elf32-i386 PLT generation:

	* elf32-i386.c (struct elf_i386_plt_layout): New type.
	(GET_PLT_ENTRY_SIZE): New macro.
	(elf_i386_plt): New variable.
	(struct elf_i386_backend_data): New member `plt'.
	(elf_i386_arch_bed): Add initializer for it.
	(elf_i386_vxworks_arch_bed): Likewise.
	(elf_i386_allocate_dynrelocs): Use GET_PLT_ENTRY_SIZE.
	(elf_i386_plt_sym_val): Likewise.
	(elf_i386_relocate_section): Likewise.
	(elf_i386_finish_dynamic_symbol): Likewise.
	Also use other elf_i386_plt_layout members for PLT details.
	(elf_i386_finish_dynamic_sections): Likewise.