[NFC][llvm-objcopy] Make helper functions static

Anywhere in tools/llvm-objcopy where functions or classes are not referenced
outside of a given file, we change things to make the function or class static
or put inside an anonymous namespace.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337220 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed