* mach-o.h (bfd_mach_o_version_min_command): New structure.
(bfd_mach_o_load_command): Add version_min.
(mach_o_data_struct): Fix comment.
* mach-o.c (bfd_mach_o_read_version_min): New function.
(bfd_mach_o_read_command): Handle BFD_MACH_O_LC_FUNCTION_STARTS,
BFD_MACH_O_LC_VERSION_MIN_MACOSX and
BFD_MACH_O_LC_VERSION_MIN_IPHONEOS.
(bfd_mach_o_get_name_or_null): New function.
(bfd_mach_o_get_name): Use the above new one.
(bfd_mach_o_load_command_name): Add the above new commands.
(bfd_mach_o_bfd_print_private_bfd_data): Display numerically
unknown commands. Handle BFD_MACH_O_LC_FUNCTION_STARTS,
BFD_MACH_O_LC_VERSION_MIN_MACOSX and
BFD_MACH_O_LC_VERSION_MIN_IPHONEOS.