Replaced the utility function to create a directory to std::filesystem.

src/misc.cpp

@@ -687,66 +687,3 @@ int write_memory_to_file(std::string filename, void* ptr, uint64_t size)
     fs.close();
     return 0;
 }
-
-// ----------------------------
-//     mkdir wrapper
-// ----------------------------
-
-// Specify relative to the current folder. Returns 0 on success, non-zero on failure.
-// Create a folder. Japanese is not used.
-// In case of gcc under msys2 environment, folder creation fails with _wmkdir(). Cause unknown.
-// Use _mkdir() because there is no help for it.
-
-#if defined(_WIN32)
-// for Windows
-
-#if defined(_MSC_VER)
-#include <codecvt> // I need this because I want wstring to mkdir
-#include <locale> // This is required for wstring_convert.
-
-namespace Dependency {
-    int mkdir(std::string dir_name)
-    {
-        std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> cv;
-        return _wmkdir(cv.from_bytes(dir_name).c_str());
-        //	::CreateDirectory(cv.from_bytes(dir_name).c_str(),NULL);
-    }
-}
-
-#elif defined(__GNUC__) 
-
-#include <direct.h>
-namespace Dependency {
-    int mkdir(std::string dir_name)
-    {
-        return _mkdir(dir_name.c_str());
-    }
-}
-
-#endif
-#elif defined(__linux__)
-
-// In the linux environment, this symbol _LINUX is defined in the makefile.
-
-// mkdir implementation for Linux.
-#include "sys/stat.h"
-
-namespace Dependency {
-    int mkdir(std::string dir_name)
-    {
-        return ::mkdir(dir_name.c_str(), 0777);
-    }
-}
-#else
-
-// In order to judge whether it is a Linux environment, we have to divide the makefile..
-// The function to dig a folder on linux is good for the time being... Only used to save the evaluation function file...
-
-namespace Dependency {
-    int mkdir(std::string /* dir_name */)
-    {
-        return 0;
-    }
-}
-
-#endif