Release 3.6.0 (2020-10-06)

Baseline: aa0d97c

Cherry picks:

• 32c88da:
  Patch RuleContext for android_binary.deps to restore legacy
  behavior.
• db9fc88:
  android_test also needs the legacy behavior in
  RuleContext.getPrerequisites.
• 144d514:
  Update android_sdk_repository to create a valid, but useless,
  repository
• bb11f92:
  Patch upb to fix build error with gcc 10
• 9f06be4:
  Patch upb to fix build error with gcc 10 (third_party)
• b67b75e:
  Fix issue where libtool_check_unique isn't found for sandbox
  builds

See release notes: https://blog.bazel.build/2020/10/06/bazel-3-6.html

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