get rid of HAS_STD_FILESYSTEM

[shuffle2]

just use std::filesystem

let's see if we can finally get rid of it...

[shuffle2]

lol

at this point i'm just going to say it's blocked until we update minimum requirements to actually support c++20.

[shuffle2]

OK, it compiles now - so ready for review

[JosJuice]

You could replace this too:

dolphin/Source/Core/DiscIO/GameModDescriptor.cpp

Lines 19 to 28 in 7abb501

	static std::string MakeAbsolute(const std::string& directory, const std::string& path)
	{
	#ifdef _WIN32
	return PathToString(StringToPath(directory) / StringToPath(path));
	#else
	if (StringBeginsWith(path, "/"))
	return path;
	return directory + "/" + path;
	#endif
	}

[shuffle2]

You could replace this too:

dolphin/Source/Core/DiscIO/GameModDescriptor.cpp

Lines 19 to 28 in 7abb501

	static std::string MakeAbsolute(const std::string& directory, const std::string& path)
	{
	#ifdef _WIN32
	return PathToString(StringToPath(directory) / StringToPath(path));
	#else
	if (StringBeginsWith(path, "/"))
	return path;
	return directory + "/" + path;
	#endif
	}

should i just merge this PR and #11426 ? wasn't sure if it was 'too much'

[JosJuice]

I think it makes sense to keep them separate.