configure: Don't disable optimization for non-fortify builds Commit b553a0428014636bc inadvertently disabled optimization for all non-fortify builds. Fix this bug so we only do an unoptimized build if we want debug. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1447082049-25099-1-git-send-email-peter.maydell@linaro.org