Remove bit of unused code
A macro and some declarations from pre-release were left in `options.h`; since I decided on using getopt and not my own options parser, it doesn't do anything and might confuse contributors. Additionally, a not-entirely-finished clause to check for the presence of `sysexits.h` was left in the configure script. I think I started implementing the whole sysexits thing before release then changed my mind. And I might change my mind again and re-implement them. I'm not sure.
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