Problems with constant socket2 non-semver changes breaking android builds

[nicbus]

as reported in #156, the android build is now broken (example):

error: /home/runner/work/rust-lnpbp/rust-lnpbp/target/debug/deps/liblnpbp_derive-5ea54e98b0ad9738.so: undefined symbol: __errno
  --> src/lib.rs:65:1
   |
65 | extern crate lnpbp_derive;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

error: could not compile `lnpbp`

[UkolovaOlga]

Context

As reported in #156, after removing the socket2 pinned version, Android build gets broken. At the moment when the problem arose, it was decided to leave it there for the time being because otherwise the new projects would not have been able to plug in LNP/BP core lib. See the corresponding comment here #156 (comment)

Logs

error: /home/runner/work/rust-lnpbp/rust-lnpbp/target/debug/deps/liblnpbp_derive-5ea54e98b0ad9738.so: undefined symbol: __errno
  --> src/lib.rs:65:1
   |
65 | extern crate lnpbp_derive;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

error: could not compile `lnpbp

Action point

This issue is the reminder to fix the mentioned bug discovered in #156 at some point. Everyone who wants to get involved/fix it can feel free to take the task.

[dr-orlovsky]

This was already fixed by me in the last RC2 before this issue was opened, which I wrote about to IRC and the PR itself: #158

[dr-orlovsky]

Reopening since the thing got broken once again: today they have yanked the version we were using before! See https://crates.io/crates/socket2

NB: This is completely unrelated issue to the previous one

[dr-orlovsky]

More background: rust-lang/socket2#139

[dr-orlovsky]

Solved by 3999313