nmosh threads: Fix thread initial VM state
nmosh threads: Remove debug print
nmosh aio win32: expose win32 chime (tentative)

This is just a tentative solution to inter-thread communication.
We absolutely need some dedicated API to do this
(instead of exposing internal crufts)
serialport: Allow closing serialport connection with (writer #f #f)
nmosh aio win32: Handle connection error on socket
dllmain: Remove debug print
nmosh aio: Fix handle leak bug win win32 aio
cmake nmosh: Add NMOSH_PRELOAD_EXCLUDES option

NMOSH_PRELOAD_EXCLUDES allows some libraries excluded from preload
archive.