Add bzl_library rules for .bzl files without one.
Add bzl_library rules for .bzl files without one.

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GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare