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`derivedConstants` currently uses `System.Info.os` for decisions (which doesn't necessarily reflect the build-target), as well as hardcoding "/usr/bin/objdump" for openbsd. This patch auto-detects `objdump` similiar to how `nm` is detected via Autoconf as well as passing the target-os into `derivedConstants` via commandline. Reviewers: austin, kgardas, erikd, bgamari Reviewed By: kgardas, erikd, bgamari Subscribers: kgardas, thomie, erikd Differential Revision: https://phabricator.haskell.org/D1499
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