src/main/java/com/fizzed/jne/JNE.java
synchronized static public File requireExecutable(String name, Options options) throws IOException {
        return requireExecutable(name, null, options);
    }
synchronized static public File requireExecutable(String name, Options options) throws IOException {
        return requireExecutable(name, null, options);
    }
Same as findExecutable but throws an exception if the executable was not
found.