Fix Travis CI build, add XCB build requirements, used in x11-clipboard

aweinstock314 / rust-clipboard

System Clipboard interfacing library in Rust

Apache License 2.0

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Open timvisee opened 4 years ago

timvisee commented 4 years ago

The Travis CI build currently fails on Linux due to new XCB requirements (in rust-clipboard -> x11-clipboard -> xcb).

This PR fixes that by installing the needed dependencies.