Merge topic 'process-refactor' d6111df5cb cmUVStream: Remove unused cmUVPipeIStream c94d70c345 cmUVProcessChain: Open output streams automatically ca0e9418f3 cmUVProcessChain: Simplify representation of merged streams 38ee29a66a cmUVProcessChain: Build stdout before stderr ca0ba19d6d cmUVStream: Fix cmUVIStream constructor compilation with legacy XL compiler 5f54ad41e7 cmCTestScriptHandler: De-duplicate WaitForLine call 6f5bbf9ee7 cmSystemTools: Remove unused timeout argument from WaitForLine Acked-by: Kitware Robot <kwrobot@kitware.com> Merge-request: !11532