socket: add functions for unspecified platforms

[zajdee]

This PR adds socket functions for unspecified (non-Linux) platforms and fixes #1069.

[adrianchiris]

minor nit otherwise lgtm

[lazysegtree]

What is pending for merge here ?

[zajdee]

I don't have the merge rights. 🥲

[lazysegtree]

@adrianchiris Do you think this can be merged, or any other work is required on this PR ?
cc : @aboch

[aboch]

please squash the commits into one

[zajdee]

@aboch AFAIK the squash can be performed during merge, so whoever will be merging this PR, they can squash the commits.
Or would you like me to do it and force push the squashed commit into this repo? (That will likely reset the approval.)

[aboch]

Please squash the commit and push again.
This project does not have the "Rebase and Squash" option enabled.

[zajdee]

I love Github. Closing PRs just like that, when one resyncs the other branch.
This is the change, squashed, in a new PR:
#1107

[aboch]

Why did you close the PR?
All you had to do is to squash your commits in your local git branch, then force push to origin...

[aboch]

I am not sure why GH closed your PR. Never happened to me before.