When installing (a subcrate) from crates.io, it fails because it cannot
find the buildscript. This is the quickfix, simply remove the
buildscript itself and the setup of the buildscript in all Cargo.toml
files.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
We should not depend on the version crate, as it is GPL licensed.
We removed the usage of this crate before, but it was still in the
Cargo.toml files (despite being used in the source).