Reapply support for X11 screenshare (#28160)

Reapplies #27807 after [revert due to not building on
ARM](https://github.com/zed-industries/zed/pull/28141) by updating scap
to include [a fix to its build on
ARM](https://github.com/zed-industries/scap/commit/08f0a01417505cc0990b9931a37e5120db92e0d0)

Release Notes:

- N/A

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Co-authored-by: Marshall Bowers <git@maxdeviant.com>
8cfb9beb17Michael Sloan committed on 4/6/2025, 5:25:29 PM· committed by GitHubparent0708d47
20 files changedLine totals unavailable