This moves licenses of vendored code from one monolith file into a tree
of individual files for easier reviews. This fixes both the bash and
bazel paths.
The upgrade of dependencies in #78187 introduced a regression in
detecting if SELinux is enabled or not. As the library requires
the golang build tag `selinux` to be enabled after that version update.
Fixes bug report #83679
Automatic merge from submit-queue
Always create vendor/BUILD in hack/update-bazel.sh
**What this PR does / why we need it**: makes sure there's always a `vendor/BUILD` file.
When updating `godeps`, the [instructions](https://github.com/kubernetes/community/blob/master/contributors/devel/godep.md) say to recursively remove `vendor/`, which also removes the `vendor/BUILD` file. Unless you manually recreate this file, running `update-bazel.sh` would instead update the `all-srcs` rule in the root `BUILD.bazel` file, which is not desired. `gazelle` and `kazel` won't create `vendor/BUILD` on their own, since there are no go sources directly in `vendor/`.
With this PR, we'll make sure that the `vendor/BUILD` file always exists, creating it if necessary.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#51075
**Release note**:
```release-note
NONE
```
/assign @spxtr @mikedanese
cc @thockin
