[llvm-objcopy]Add support for *-freebsd output formats
GNU objcopy can support output formats like elf32-i386-freebsd and
elf64-x86-64-freebsd. The only difference from their regular non-freebsd
counterparts that I have observed is that the freebsd versions set the
OS/ABI field to ELFOSABI_FREEBSD. This patch sets the OS/ABI field
according based on the format whenever --output-format is specified.
Reviewed by: rupprecht, grimar
Differential Revision: https://reviews.llvm.org/D59645
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356737
91177308-0d34-0410-b5e6-
96231b3b80d8
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