d/rules: remove conflicting binaries

Some of the executables installed by `rust-coreutils` are already
provided by other packages:
- `more` is provided by `util-linux`
- `hostname` is provided by `hostname`
- `kill` and `uptime` are provided by `procps`

Removing those executables from this package solves conflicts.

Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>