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When -Wextra was added, the warning levels changed their meaning. Add a description in the build option section and leave the security hardening section as mostly a pointer to it. Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com> Change-Id: Iabf2f598d0bf3e865c9b991c5d44d2acb9572bd5