This enables readobj to output Windows resource files (.res). This way,
we'll be able to test .res outputs without comparing them byte-by-byte
with "magic binary files" generated by MS toolchain.
Differential Revision: https://reviews.llvm.org/D38058
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313790 91177308-0d34-0410-b5e6-96231b3b80d8
