Creation of LTS branch "lts_2018_12_18"

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  - 5aae0cff Fix CMake build (#173) by Stephan Dollberg <stephan.dollberg@gmail.com>
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GitOrigin-RevId: 44b0fafc
Change-Id: I2c427b5b41b2d34101922048b00f3d9dafcb498d