Release 3.7.2 (2020-12-17)

Baseline: d0efd7b -3.7.1

Cherry picks:

• a689d67:
  Use getRunfilesPath for run_under executable path generation.
  getRootRelativePath doesn't return a valid runfiles path for
  external source files anymore after the recent external source
  root change. Also, it won't work for external labels either once
  the --nolegacy_external_runfiles becomes default. This fixes
  issue #12545.

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