Revert "Implement xcb input shapes (#4036)" (fixes #4074)

[actionless]

This reverts commit 27c8fa5.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.42%. Comparing base (fa805ab) to head (f8cf313).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4100      +/-   ##
==========================================
- Coverage   90.47%   90.42%   -0.06%     
==========================================
  Files         941      940       -1     
  Lines       60391    60258     -133     
  Branches     1145     1139       -6     
==========================================
- Hits        54637    54486     -151     
- Misses       5247     5266      +19     
+ Partials      507      506       -1     

Files with missing lines	Coverage Δ
event.c	72.50% <ø> (+0.28%)	⬆️
lib/awful/client/shape.lua	100.00% <ø> (ø)
objects/client.c	78.39% <ø> (-1.30%)	⬇️
tests/examples/shims/client.lua	100.00% <ø> (ø)
tests/test-client-shape.lua	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.