It's suddenly started breaking the build, not obvious why. Disabling it is the
easiest solution. It's not required for these plugins that are only needed to
serve the keycloak build itself.
Symlinks are frequently unavailable on Windows (must be on NTFS and user must
have SeCreateSymbolicLinkPrivilege). Removing the symlinks for licenses/common/
should enable the build to function mostly normally on Windows. The individual
license files will be incorrect, but that shouldn't matter for local builds.
Release builds are done on *nix.
The plugin rolls several different plugin executions into one. The common files
are distributed using a resource jar, used by and unpacked by the plugin.