Revert "sync_test: Use -fno-strict-aliasing"

This reverts commit ecd594c7e2aec9657bee9e3935eccdf5fb4900ad.
Revert "core: Fix build in ISO C++11 mode"

This reverts commit 4bd8184ab3f1b07ae13c2631f448a2e2ebbd956d.
Revert "adb: Don't force -O2"

This reverts commit 423acef3172c4461de3a768ee97984d8964465de.