Remove no longer necessary WinCmdLineArgs class

This change removes one use case of `std::wstring_convert`, which is
deprecated in C++17 and removed in C++26. Other uses remain for now.

src/common/args.cpp

@@ -19,8 +19,6 @@
 #include <util/string.h>
 
 #ifdef WIN32
-#include <codecvt>
-#include <shellapi.h>
 #include <shlobj.h>
 #endif
 
@@ -879,30 +877,3 @@ void ArgsManager::LogArgs() const
     }
     logArgsPrefix("Command-line arg:", "", m_settings.command_line_options);
 }
-
-namespace common {
-#ifdef WIN32
-WinCmdLineArgs::WinCmdLineArgs()
-{
-    wchar_t** wargv = CommandLineToArgvW(GetCommandLineW(), &argc);
-    std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t> utf8_cvt;
-    argv = new char*[argc];
-    args.resize(argc);
-    for (int i = 0; i < argc; i++) {
-        args[i] = utf8_cvt.to_bytes(wargv[i]);
-        argv[i] = &*args[i].begin();
-    }
-    LocalFree(wargv);
-}
-
-WinCmdLineArgs::~WinCmdLineArgs()
-{
-    delete[] argv;
-}
-
-std::pair<int, char**> WinCmdLineArgs::get()
-{
-    return std::make_pair(argc, argv);
-}
-#endif
-} // namespace common