Build 18334

For general Windows information on build 18334 visit the Windows blog.

WSL

• Redesign the way that Windows time zone is mapped to a Linux time zone [GH 3747]
• Fix memory leaks and add new string translation functions [GH 3746]
• SIGCONT on a threadgroup with no threads is a no-op [GH 3741]
• Correctly display socket and epoll file descriptors in /proc/self/fd