Port from nix to rustix

[ids1024]

#653

Incomplete. Looks like rustix needs support for SO_PEERCRED.

[ids1024]

See bytecodealliance/rustix#851 for SO_PEERCRED.

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (8581b9d) 73.02% compared to head (a96ce07) 73.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #658      +/-   ##
==========================================
+ Coverage   73.02%   73.16%   +0.13%     
==========================================
  Files          47       47              
  Lines        7779     7795      +16     
==========================================
+ Hits         5681     5703      +22     
+ Misses       2098     2092       -6     

Flag	Coverage Δ
main	58.48% <63.21%> (+0.13%)	⬆️
test--	78.26% <93.24%> (?)
test--server_system	61.43% <44.59%> (+0.08%)	⬆️
test-client_system-	69.12% <84.00%> (+0.02%)	⬆️
test-client_system-server_system	51.38% <17.33%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
wayland-backend/src/rs/server_impl/client.rs	75.40% <100.00%> (ø)
wayland-backend/src/rs/server_impl/common_poll.rs	86.82% <100.00%> (ø)
wayland-backend/src/rs/server_impl/handle.rs	69.46% <100.00%> (+0.41%)	⬆️
wayland-backend/src/sys/client_impl/mod.rs	71.32% <100.00%> (ø)
wayland-server/src/socket.rs	45.55% <100.00%> (ø)
wayland-client/src/conn.rs	85.03% <91.66%> (+1.16%)	⬆️
wayland-client/src/event_queue.rs	58.40% <0.00%> (ø)
wayland-backend/src/rs/socket.rs	93.44% <92.30%> (+3.66%)	⬆️
wayland-cursor/src/lib.rs	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[ids1024]

Now this just needs bytecodealliance/rustix#851 to be merged and released, and I guess I need to test on a BSD to update the kqueue code.

[daxpedda]

I was wondering why libc was added here, it seems to me it could be dropped entirely.
(despite the fact it's still in the dependency tree of course)