x86: Add _bfd_elf_x86_copy_special_section_fields

When Linux/x86 objcopy is used on Solaris binary, it sets EI_OSABI to
ELFOSABI_SOLARIS, but it doesn't set the sh_info and sh_link fields of
Solaris specific sections.

Add _bfd_elf_x86_copy_special_section_fields to return false for Solaris
binary to properly set the sh_info and sh_link fields of Solaris specific
sections.

	PR binutils/33705
	* elf32-i386.c (elf32_i386_copy_solaris_special_section_fields):
	Removed.
	(elf_backend_copy_special_section_fields): Likewise.
	* elf64-x86-64.c (elf64_x86_64_copy_solaris_special_section_fields):
	Likewise.
	(elf_backend_copy_special_section_fields): Likewise.
	* elfxx-x86.c (_bfd_elf_x86_copy_special_section_fields): New.
	* elfxx-x86.h (_bfd_elf_x86_copy_special_section_fields): Likewise.
	(elf_backend_copy_special_section_fields): Likewise.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>