Function flowlang::Java_com_newbound_code_LibFlow_build

#[no_mangle]
pub extern "system" fn Java_com_newbound_code_LibFlow_build(
    env: JNIEnv<'_>,
    class: JClass<'_>,
    lib: JString<'_>,
    ctl: JString<'_>,
    cmd: JString<'_>
) -> jstring