Get rid of unmaintened getopt package

I've made a [custom getopt package][2] that breaks POSIX, it continues parsing options even after a *non option* is found. I am not going to maintain this package, so best is to freeze it and mark the package as unmaintained.

[1]: https://github.com/augustohp/reading-dump/milestone/1
[2]: https://github.com/augustohp/getopt-php/commit/a498fb809181b31730315e980a927091cd731283