Merge branch 'js/simple-ipc-cygwin-socket-fix'

The way Cygwin emulates a unix-domain socket, on top of which the
simple-ipc mechanism is implemented, can race with the program on
the other side that wants to use the socket, and briefly make it
appear as a regular file before lstat(2) starts reporting it as a
socket.  We now have a workaround on the side that connects to a
unix domain socket.

* js/simple-ipc-cygwin-socket-fix:
  simple-ipc: work around issues with Cygwin's Unix socket emulation