[libc] Add write(2) implementation for Linux and FDReader test utility
Summary: Adds `write` for Linux and FDReader utility which should be useful for some stdio tests as well. Reviewers: sivachandra, PaulkaToast Reviewed By: sivachandra Subscribers: mgorny, tschuett, libc-commits Differential Revision: https://reviews.llvm.org/D78184
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