LWG-2682 filesystem::copy() won't create a symlink to a directory

[StephanTLavavej]

LWG-2682 filesystem::copy() won't create a symlink to a directory

Before attempting to implement this, we would like to wait for LWG-3057 "Correct copy_options handling" to be resolved.

Edit: It doesn't seem that LWG-3057 "Correct copy_options handling" will be resolved any time soon. I don't think we need to keep blocking on it.

[frederick-vs-ja]

There seems already a branch handling this.

STL/stl/inc/filesystem

Lines 4327 to 4331 in 994f941

	if (_STD filesystem::is_directory(_Fstat._Status)) {
	if ((_Options & copy_options::create_symlinks) != copy_options::none) {
	_Ec = _STD make_error_code(errc::is_a_directory);
	return;
	}