[PATCH] Implement objcopy/strip --keep-section=<sectionpattern>

[Fāng-ruì Sòng via binutils]

llvm-objcopy and llvm-strip support an option --keep-section that
keeps some sections from being removed.
https://llvm.org/docs/CommandGuide/llvm-objcopy.html#cmdoption-llvm-objcopy-keep-section

This may be useful for distributions that really want to keep .ctf
https://sourceware.org/ml/binutils/2019-10/msg00016.html
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