Makefile: Improve test speeds
Tests were launched with -O0 option to make debugging easier, in particular with gdb but also possibly with Valgrind. However this induces a large time penaly. As we want to improve test speeds (#2254), it should be a good idea to use -O2. Note that we do not compile with -DNDEBUG, which would improve speed test only slightly. It is important that assertions are tested. Unit and functional tests are the perfect place for that.
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