Christian Blichmann 00e724fb8a CMake build improvements
- Try to fix Ninja needlessly rebuilding everything every time
  See https://stackoverflow.com/questions/47087237/cmake-and-ninja-rebuild-unnecessary-files/47100426#47100426
- Since SAPI requires CMake >= 3.12, remove custom `list_join`

PiperOrigin-RevId: 333281764
Change-Id: I334d67d7ee54d21824b19e60a7a7f1e43bb5a057
2020-09-23 06:43:01 -07:00
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2020-09-23 06:43:01 -07:00
2020-09-23 06:43:01 -07:00