zpc: wish offline build

[rzr]

Pulling deps at compilation time is a fragile practice:

For any reason it can fail, for instance some VPN may blacklist downloading executables and then FTBFS:

eg:

docker build https://github.com/SiliconLabsSoftware/z-wave-protocol-controller.git#ver_1.7.0

setup/debian: TODO: Support debian stable rustc=1.63 https://tracker.debian.org/pkg/rustc
setup/rust: TODO: Support https://tracker.debian.org/pkg/rustup
curl --insecure  --proto '=https' --tlsv1.2 -sSf  https://sh.rustup.rs | bash -s -- -y --default-toolchain 1.71.0
info: downloading installer
warn: curl: (60) SSL certificate problem: self-signed certificate in certificate chain
More details here: https://curl.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
error: command failed: downloader https://static.rust-lang.org/rustup/dist/x86_64-unknown-linux-gnu/rustup-init /tmp/tmp.6Bmew165sU/rustup-init x86_64-unknown-linux-gnu
make: *** [helper.mk:131: setup/rust] Error 1
The command '/bin/sh -c echo "# log: Setup system" 

As suggested in log, using an integrated version (from distros) can prevent such breakage.

[rzr]

Also observed with crates:

 Downloading crates ...
error: failed to download from `https://static.crates.io/crates/shlex/1.3.0/download`

Caused by:
  [60] SSL peer certificate or SSH remote key was not OK (SSL certificate problem: self signed certificate in certificate chain)

Relate-to: #58