util/djbhash: use uint_fast32_t internally
util/djbhash: use uint_fast32_t internally

uint_fast32_t may be faster than uint32_t on some architectures.

CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy