client: Implement AsFd for Connection and EventQueue

[ids1024]

This helps for using an Generic<EventQueue> with calloop 0.11.

#635 added this server-side for use in Smithay; the same thing seems useful for sctk.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.24% ⚠️

Comparison is base (cf825be) 73.26% compared to head (b2c9e76) 73.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #656      +/-   ##
==========================================
- Coverage   73.26%   73.03%   -0.24%     
==========================================
  Files          47       47              
  Lines        7755     7780      +25     
==========================================
  Hits         5682     5682              
- Misses       2073     2098      +25     

Flag	Coverage Δ
main	58.31% <0.00%> (-0.19%)	⬇️
test--	78.08% <0.00%> (-0.23%)	⬇️
test--server_system	61.35% <0.00%> (-0.14%)	⬇️
test-client_system-	69.11% <0.00%> (-0.29%)	⬇️
test-client_system-server_system	51.42% <0.00%> (-0.18%)	⬇️

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

Files Changed	Coverage Δ
wayland-backend/src/client_api.rs	86.36% <0.00%> (-4.12%)	⬇️
wayland-backend/src/rs/client_impl/mod.rs	78.06% <0.00%> (-0.89%)	⬇️
wayland-backend/src/sys/client_impl/mod.rs	71.32% <0.00%> (-1.01%)	⬇️
wayland-client/src/conn.rs	83.87% <0.00%> (-2.08%)	⬇️
wayland-client/src/event_queue.rs	58.14% <0.00%> (-0.78%)	⬇️

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[elinorbgr]

LGTM, just a few nitpicks on the changelogs. 👍

[elinorbgr]

If you rebase on master, the CI issues should go away. :)

[elinorbgr]

Thanks!