Remove auto launch for /bin/xaos in Makefile

[Begasus]

Is your feature request related to a problem? Please describe.
Trying to update our Haiku port to the latest release, the build works fine and the binary is OK too.
But when building at the end xaos gets launches, this stops the process to complete the package.
I can close xaos and the package moves on to a full package, on our buildmaster there is no one to close xaos and therefore it will stand still and not continue to create the package.
Hence we can't add it to our repository.

Describe the solution you'd like
A solution on how to disable the launch during build process.

Describe alternatives you've considered
Looked through the source but haven't found an option to disable this.

Additional context