Add support for building Cargo-C recipes for native builds
WIP till phase 1 items are complete.
Will probably want some image updates for the bootstrap phase...
Steps to test:
./cerbero-uninstalled -v rust fetch-bootstrap
./cerbero-uninstalled -v rust bootstrap --offline
./cerbero-uninstalled -v rust fetch-package gstreamer-1.0
./cerbero-uninstalled -v rust package gstreamer-1.0 --offline -t
Enabled by default for macOS, MSVC, Linux (without static plugins). Does work on iOS and Android, but static libs are too huge, so not enabled by default for now.
Edited by Nirbheek Chauhan