Make fs::path::string() always return utf-8 string

src/util.cpp

@@ -1206,7 +1206,11 @@ void SetupEnvironment()
     // A dummy locale is used to extract the internal default locale, used by
     // fs::path, which is then used to explicitly imbue the path.
     std::locale loc = fs::path::imbue(std::locale::classic());
+#ifndef WIN32
     fs::path::imbue(loc);
+#else
+    fs::path::imbue(std::locale(loc, new std::codecvt_utf8_utf16<wchar_t>()));
+#endif
 }
 
 bool SetupNetworking()