PARIS — Police detained and questioned an 8-year-old boy from the south of France who claimed to support the men who attacked the satirical weekly Charlie Hebdo, drawing criticism Thursday that France’s measures to prevent people from defending terrorism have gone overboard. Dozens of people have been arrested and accused of defending terrorism since the attacks, with some already drawing years long prison terms in special expedited court proceedings. The Muslims did well, and the journalists got what they deserved, Fabienne Lewandowski, deputy director for public security in the Alpes-Maritimes region, told BFM television.