[DynInst_API:] [dyninst/dyninst] ebdf96: Remove Symtab::changeSymbolOffset (#1567)

[Tim Haines <noreply@xxxxxxxxxx>]

  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: ebdf9625ddc8a659ff2a4afa6d34e84dff081b5e
      https://github.com/dyninst/dyninst/commit/ebdf9625ddc8a659ff2a4afa6d34e84dff081b5e
  Author: Tim Haines <thaines.astro@xxxxxxxxx>
  Date:   2023-10-09 (Mon, 09 Oct 2023)

  Changed paths:
    M symtabAPI/h/Symtab.h
    M symtabAPI/src/Symtab-edit.C

  Log Message:
  -----------
  Remove Symtab::changeSymbolOffset (#1567)

It is never used. Not a breaking change as it's private.

I have left the function of the same name in Aggregate because it's
protected, there is a virtual dtor, and that class is accessible by
users. It's possible that someone is using it.