program_options.hpp fails when imported as a header unit (MSVC 2022).

The program fails to compile when trying to import `program_options.hpp` as a header unit in Visual Studio 2022 (C++20).

main.cpp
```
import ;

int main(int argc, char** argv)
{
namespace po = boost::program_options;
po::options_description desc;
desc.add_options()
("stringtest", po::value()->implicit_value("test"), "string test")
;

return 0;
}
```

You'll get the following error:
`Error - C3084 - 'boost::exception::~exception': a destructor cannot be 'abstract' - solution - E:\Projects\CPP\boost\boost\exception\exception.hpp - 297`

I haven't had any troubles with any other boost headers. This is the only one I've run into with this issue. This was tested with the latest master branch.