bfd: Don't hard-code BFD_JUMP_TABLE_COPY

bfd: Don't hard-code BFD_JUMP_TABLE_COPY

In BFD_JUMP_TABLE_COPY, replace _bfd_generic_init_private_section_data
with NAME##_init_private_section_data so that ELF targets can properly
replace it with _bfd_elf_init_private_section_data.

	* aout-target.h (MY_init_private_section_data): New.
	* coff-rs6000.c (_bfd_xcoff_init_private_section_data): New.
	* coffcode.h (coff_init_private_section_data): New.
	* elfxx-target.h (bfd_elfNN_init_private_section_data): New.
	* libecoff.h (_bfd_ecoff_init_private_section_data): New.
	* mach-o-target.c (bfd_mach_o_init_private_section_data): New.
	* mmo.c (mmo_init_private_section_data): New.
	* plugin.c (bfd_plugin_init_private_section_data): New.
	* ppcboot.c (ppcboot_init_private_section_data): New.
	* som.c (som_init_private_section_data): New.
	* targets.c (BFD_JUMP_TABLE_COPY): Replace
	_bfd_generic_init_private_section_data with
	NAME##_init_private_section_data.
	* vms-alpha.c (vms_init_private_section_data): New.
	* elf-bfd.h (_bfd_generic_init_private_section_data): Removed.
	* bfd-in2.h: Regenerated.