Flag --incompatible_disable_depset_items will break rules_cc in a future Bazel release

[bazel-flag-bot]

Incompatible flag --incompatible_disable_depset_items will be enabled by default in a future Bazel release [1], thus breaking rules_cc.

The flag is documented here: https://github.com/bazelbuild/bazel/issues/9017

Please check the following CI builds for build and test results:

• Windows, OpenJDK 8
• macOS, OpenJDK 8
• Ubuntu 16.04, OpenJDK 8
• Ubuntu 18.04, OpenJDK 11

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If you don't want to receive any future issues for rules_cc or if you have any questions, please file an issue in https://github.com/bazelbuild/continuous-integration

Important: Please do NOT modify the issue title since that might break our tools.

[1] The target release hasn't been determined yet. Our tool will update the issue title once the flag flip has been scheduled.

[Yexo]

Fixing in https://github.com/bazelbuild/rules_cc/pull/69