PR 33453 linker generated .eh_frame

PR 33453 linker generated .eh_frame

This is the final piece to fix the PR33453 testcase.  It makes use of
the extended size final link buffer when writing linker generated
.eh_frame.

	PR 33453
	* elf-bfd.h (_bfd_elf_write_linker_section_eh_frame): Declare.
	* elf-eh-frame.c (_bfd_elf_write_linker_section_eh_frame): New.
	* elf32-ppc.c (ppc_elf_finish_dynamic_sections): Use new function.
	* elf64-ppc.c (ppc64_elf_finish_dynamic_sections): Likewise.
	* elf64-s390.c (elf_s390_finish_dynamic_sections): Likewise.
	* elfxx-x86.c (_bfd_x86_elf_finish_dynamic_sections): Likewise.