[lld] [LLD] [MinGW] Implement --dependent-load-flag option (PR #113814)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

This looks reasonable, thanks! Let's hope that binutils can align on the name and behaviour of the flag, if they also get to implementing this.

And as high level view of what it does - this sets one value in the `_load_config_used` struct, if such a symbol happens to be found at link time, right?

https://github.com/llvm/llvm-project/pull/113814