Revert "move compile time version information (#6050)"

[graphaelli]

Temporarily remove version info that is not provided by the current release process.

before:

$ ./libbeat version 
mockbeat version 9.9.9 (amd64), libbeat 6.2.0 [unknown built unknown]

after:

$ ./libbeat version
mockbeat version 9.9.9 (amd64), libbeat 6.2.0

for #6051

[ruflin]

@graphaelli Did you investigate on why it's not in 6.2? Lets see if we can get this later in again for the next 6.x releases.

[graphaelli]

I ran out of time to investigate. I assume something in the package target does a go build directly rather than relying on the ${BEAT_NAME} name. I imagine we need that for cgo to work. I'll follow up with you directly.

[graphaelli]

@ruflin I can't find an issue for fixing this, but I have a fix (updates to dev-tools/packer/docker/xgo-image/beats-builder/build.sh) that works for the linux package, and I think the windows package (haven't tested directly), but doesn't work for darwin. I'll ask for help if I can't figure it out.

[graphaelli]

figured it out, can only provide one -ldflags arg to go build, last one wins