macOS again.

Details

- We are using the toolchain compiler and archiver in order
to generate a proper ELF file when building the 'raw-cpuid'
crate C code which is currently being compiled by the macOS
toolchain.

- I added the 'findutils' and 'coreutils' Homebrew/MacPorts
packages to the bootstrap script in order to setup the proper
environment for the cookbook scripts (as the assume GNU tools).
This should be temporary until the cookbook scripts get migrated
to Rust.