Host tools compile error on macOS due to deprecated C++ construct

On macOS, Apple has removed the base std::char_traits template. xml2sdb uses this template (in the form of std::basic_string<WCHAR>), and as a result no longer compiles under Xcode 16.3. Apple has announced [1] that they are restoring the template temporarily, but it will still be removed permanently soon. As a result, it will be completely impossible to develop ReactOS on a Mac after this occurs. I’m not certain what should be done.

[1]: https://developer.apple.com/documentation/xcode-release-notes/xcode-16_4-release-notes#Resolved-Issues