x86: Add is_solaris to elf_x86_target_os

x86: Add is_solaris to elf_x86_target_os

Add is_solaris to elf_x86_target_os since Solaris is quite different.

	* elf32-i386.c (elf_i386_get_synthetic_symtab): Also handle
	is_solaris.
	(i386_elf32_sol2_vec): Don't declare.
	(elf_i386_link_setup_gnu_properties): Also handle is_solaris.
	Don't set need_global_offset_table.
	(elf_i386_solaris_arch_bed): New.
	(elf_backend_arch_data): Set to elf_i386_solaris_arch_bed for
	Solaris.
	* elf64-x86-64.c (elf_x86_64_get_synthetic_symtab): Check
	target_os != is_nacl instead of target_os == is_normal.
	(x86_64_elf64_sol2_vec): Don't declare.
	(elf_x86_64_link_setup_gnu_properties): Check target_os !=
	is_nacl instead of target_os == is_normal.  Don't set
	need_global_offset_table.
	(elf_x86_64_solaris_arch_bed): New.
	(elf_backend_arch_data): Set to elf_x86_64_solaris_arch_bed for
	Solaris.
	* elfxx-x86.c (_bfd_x86_elf_size_dynamic_sections): Keep
	_GLOBAL_OFFSET_TABLE_ for Solaris.
	(_bfd_x86_elf_link_setup_gnu_properties): Don't copy
	need_global_offset_table.
	* elfxx-x86.h (elf_x86_target_os): Add is_solaris.
	(elf_x86_link_hash_table): Remove need_global_offset_table.
	(elf_x86_init_table): Likewise.

(cherry picked from commit 3b4c384407ebbdd9ed4ad5057080b3be038b8748)