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gsocket: use socklen_t in more places to fix build under cygwin

Christoph Reiter requested to merge creiter/glib:use-socklen-t into main

cygwin defines socklen_t as int, unlike everywhere else where it is uint32_t (afaics), so signed vs unsigned.

The recently added -Werror=pointer-sign in 43538130 makes the build fail under cygwin now with something like:

error: pointer targets in passing argument 5 of ‘getsockopt’ differ in signedness [-Werror=pointer-sign]

This changes guint to socklen_t where needed for getsockname, getpeername and getsockopt.

The second commit fixes two small related warnings.

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