Release 1.2.0 (2019-11-20)

Baseline: 11deef7

Cherry picks:

• c76c3e5:
  Replace macOS CC path with relative path
• 63332eb:
  Hardcode path to dirname on macOS
• ceadf0a:
  Add tool executables (from FilesToRunProvider) to action inputs.
• dbe63b0:
  Fix some of the bazel Windows tools code to work with GCC.

Release announcement is on our blog: https://blog.bazel.build/2019/11/20/bazel-1.2.0.html

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