Implement TOKU_ATTRIBUTE to replace __attribute__

Description

Similar to upstream MySQL change, to keep things sort of consistent, implement macro replacing _attribute_ with TOKU_ATRIBUTE and perhaps some frequently used specializations. See https://github.com/percona/percona-server/commit/567bb732bc0e2de38f10c1793dcc0a0c6f877742

Environment

None

Assignee

George Lorch

Reporter

George Lorch

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Priority

Minor