objconv 2.36 (new formula) object and executable utilities

objconv is a utility for cross-platform development of function libraries, for converting and modifying object files and for dumping and disassembling object and executable files for all x86 and x86-64 platforms.

objconv formulas have been submitted twice before (#10441 and #17153), however neither formula was audited or tested. In fact, neither formula would install because of a nested archive.
I've stuck a static zip [here](https://github.com/DomT4/LibreMirror/tree/master/Objconv) for now, for my own use in terms of knowing it's not going to slide out from under me suddenly. Can use that if particularly desired, but obviously the end goal is to get upstream to move away from a dynamic download link. I don't know if anyone ever punted that request upstream in the end though.