[llvm-objcopy] Hook up the -V alias to --version, output "GNU strip"

This allows libtool to detect the presence of llvm-strip and use
it with the options --strip-debug and --strip-unneeded.

Also hook up the -V alias for objcopy.

Differential Revision: https://reviews.llvm.org/D54936

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@347731 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed