Function wasm_extern_as_func_const 

#[unsafe(no_mangle)]
pub extern "C" fn wasm_extern_as_func_const(
    e: &wasm_extern_t,
) -> Option<&wasm_func_t>

Returns the wasm_extern_t as reference to shared wasm_func_t if possible.

Returns None if e is not a wasm_func_t.