Function generate_meson 

pub fn generate_meson(
    modules: &[Module],
    order: &[usize],
    config: MesonConfig,
) -> Result<String, Box<dyn Error>>

Generate a meson.build for one or more ASN.1 modules.

modules is the full slice of parsed modules; order is the topological generation order returned by crate::import_graph::topological_order (dependencies-first). Pass &[0] when there is only one module.