Mach-O LC_SYMTAB parsing emits "Weird" messages for empty tables

[liamwhite]

Describe the bug
For kernelcollections files like the x86_64 BootKernelExtensions.kc, there is an empty symtab load command which is intended to be consumed by boot.efi:

Load command 3
     cmd LC_SYMTAB
 cmdsize 24
  symoff 0
   nsyms 0
  stroff 0
 strsize 0

Because symoff and stroff are set to 0 (even though nsyms is also 0, so there isn't any place to put them anyway), LIEF emits "Weird" messages from here:

LIEF/src/MachO/BinaryParser.tcc

Lines 3637 to 3659 in aca974e

	LIEF_WARN("Weird: LC_SYMTAB.n_list is not in the __LINKEDIT segment");
	}
	}
	/* strtable */ {
	span<uint8_t> content = strings_linkedit->content();
	const uint64_t rel_offset =
	cmd.strings_offset() - strings_linkedit->file_offset();
	const size_t strtab_size = cmd.strings_size();
	if (rel_offset > content.size() || (rel_offset + strtab_size) > content.size())
	{
	LIEF_ERR("The LC_SYMTAB.strtab is out of bounds of the segment {}",
	strings_linkedit->name());
	return make_error_code(lief_errors::read_out_of_bound);
	}
	cmd.string_table_ = content.subspan(rel_offset, strtab_size);
	if (LinkEdit::segmentof(*strings_linkedit)) {
	static_cast<LinkEdit*>(strings_linkedit)->symtab_ = &cmd;
	} else {
	LIEF_WARN("Weird: LC_SYMTAB.strtab is not in the __LINKEDIT segment");

To Reproduce
Parse the x86_64 BootKernelExtensions.kc file.

Expected behavior
No "Weird" messages should print.

Environment (please complete the following information):

• System and Version: Fedora 43
• Target format: Mach-O
• LIEF commit version: 0.17.3-03aca30b

Additional context
As far as I can tell, there isn't a rule in the Mach-O format that says that symtab or dysymtab even have to be in the LINKEDIT segment, so this is probably just a more general case of what's happening in #1307