Avoid printf warning in scheduler_ev_add

  CC       src/common/compat_threads.o
src/or/scheduler.c:511:55: error: format specifies type 'long' but the argument
      has type '__darwin_suseconds_t' (aka 'int') [-Werror,-Wformat]
                       "%ld.%06ld", next_run->tv_sec, next_run->tv_usec);
                            ~~~~~                     ^~~~~~~~~~~~~~~~~
                            %06d
./src/common/torlog.h:230:51: note: expanded from macro 'log_warn'
  log_fn_(LOG_WARN, domain, __FUNCTION__, args, ##__VA_ARGS__)

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