Allow optimization level to be set in Makefile (#7202)
Summary: `-O3` is already adopted widely, so we should make it easier to configure for development/open source. This PR adds an `OPTIMIZE_LEVEL` variable that users can set to override the `-O` flag chosen in the Makefile. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7202 Test Plan: built a few different ways and verified correct value is passed for `-O` flag Reviewed By: pdillinger Differential Revision: D22845291 Pulled By: ajkr fbshipit-source-id: 84471362e7d627dd606b25bf5f6a3d796817fa1c
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