Go 1.14 added runtime support for handling the windows CTRL_CLOSE_EVENT,
CTRL_LOGOFF_EVENT, and CTRL_SHUTDOWN_EVENT events by adding a definition
for syscall.SIGTERM to windows and converting the events to that signal.
It also added definitions for other common signals, including SIGHUP,
and treats them as NOOPs on windows.
Consequently, this modifies the logic that deals with conditionally
handling SIGTERM and SIGHUP to handle them for windows as well as all
unix-like operating systems, including newer ones that are supported by
Go since the code was originally written.
Although the additional signals could probably just be added
unconditionally without too much issue now due to the runtime adding
stubs to all operating systems the project officially supports, it is
safer to be explicit when dealing with syscall definitions since there
is no guarantee that they will exist for newly-added operating systems.
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