Flag --incompatible_disallow_empty_glob will break Bazel skylib in Bazel 1.2.1

Incompatible flag --incompatible_disallow_empty_glob will break Bazel skylib once Bazel 1.2.1 is released.

Please see the following CI builds for more information:

* [:windows: (OpenJDK 8)](:windows: (OpenJDK 8))
* [:ubuntu: 16.04 (OpenJDK 8)](:ubuntu: 16.04 (OpenJDK 8))
* [:ubuntu: 18.04 (OpenJDK 11)](:ubuntu: 18.04 (OpenJDK 11))
* [:darwin: (OpenJDK 8)](:darwin: (OpenJDK 8))

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.

Start with the four linked Bazel CI failures and compare the failing skylib behavior with the affected glob usage. Identify the compatibility changes required for --incompatible_disallow_empty_glob, then verify that the referenced Windows, Ubuntu, and Darwin builds pass with the flag enabled.

Written by the indexing model from the issue text.