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Various socket-related fixes for win32

Marc-André Lureau requested to merge malureau/glib:win32-socket into main

Similar to what was done in commit 2a925f27, the spawn-helper shouldn't assume the inherited fd are simple HANDLE. If they are actually SOCKET, we should use WSADuplicateSocket API.

I introduce new private API to check if a HANDLE is a SOCKET, and to reopen a handle with NOINHERIT. This is useful for testing purposes, but also in future work I intend to submit to allow HANDLE-passing over DBus.

(I aslo included a few simple not-directly-related patches here, to avoid maintaining/working on dozen of branches)

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