bfd_copy_private_symbol_data

bfd_copy_private_symbol_data

Allow copy_private_symbol_data to replace osym if a target desires.
Change isym similarly for symmetry.  The idea is to make it possible
to give the asymbol an output target specific extension.  Some
targets, eg. som, use such an extension when outputting symbols,
behaving badly if the input object is not som.  There are no
functional changes in this patch; It just changes the signatures.

bfd/
	* elf-bfd.h (_bfd_elf_copy_private_symbol_data): Replace
	asymbol* params with asymbol**.
	* elf.c (_bfd_elf_copy_private_symbol_data): Likewise.
	* libbfd-in.h (_bfd_bool_bfd_asymbol_bfd_asymbol_true): Likewise.
	* libbfd.c (_bfd_bool_bfd_asymbol_bfd_asymbol_true): Likewise.
	* mach-o.c (bfd_mach_o_bfd_copy_private_symbol_data): Likewise.
	* mach-o.h (bfd_mach_o_bfd_copy_private_symbol_data): Likewise.
	* plugin.c (bfd_plugin_bfd_copy_private_symbol_data): Likewise.
	* som.c (som_bfd_copy_private_symbol_data): Likewise.
	* targets.c (bfd_target <_bfd_copy_private_symbol_data>): Likewise.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.
binutils/
	* objcopy.c (copy_object): Adjust bfd_copy_private_symbol_data call.
gas/
	* symbols.c symbol_clone): Adjust bfd_copy_private_symbol_data call.