[llvm] [llvm-objcopy] Add --skip-symbol and --skip-symbols options (PR #80873)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

> https://sourceware.org/bugzilla/show_bug.cgi?id=31000#c3 Nick has a comment whether we really need a filename variant option, since we can just use `@xxx`

This thread refers to the `--set-symbol-visibility` option, not the `--skip-symbols` option in this ticket. Here, I think `--skip-symbols` makes sense, since it's not something you need any further flexibility with.

https://github.com/llvm/llvm-project/pull/80873