Build 18890

For general Windows information on build 18890 visit the Windows blog.

WSL

• Non-blocking socket leak [GH 2913]
• EOF input to terminal can block subsequent reads [GH 3421]
• Update resolv.conf header to refer to wsl.conf [discussed in GH 3928]
• Deadlock in epoll delete code [GH 3922]
• Handle spaces in arguments to --import and –export [GH 3932]
• Extending mmap’d files does not work properly [GH 3939]
• Fix issue with ARM64 \wsl$ access not working properly
• Add better default icon for wsl.exe