Using executable scripts with shebang is risky on UNIX, where python3
may not be present. Instead, use find_program('python3'), which Meson
provides a fallback for if it cannot find it in the environment.
- Import preprocessor definitions from config.gypi, to avoid ABI
compatibility issues.
- Support compiling for specific runtimes and target versions.
- Add prebuild packaging logic.
- Wire up Windows support.