[llvm] [llvm-objcopy] Add llvm-objcopy option --ignore-symbol (PR #80873)

[Ilia Kuklin via llvm-commits]

kuilpd wrote:

> Thanks. This doesn't seem unreasonable to me. However, a) I don't like the name (people may think that `--ignore-symbol` can be used to prevent stripping of a symbol, for example, or similar), and b) you really should reach out to the binutils folk to get their opinions on the feature and its name.

So far got a reply suggesting to rename it to "--skip-symbols". Seems fair to me.

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