Reported by clang:

  Key.c:46:9: warning: macro is not used [-Wunused-macros]
  #define Time_t time_t
          ^
  Key.c:52:9: warning: macro is not used [-Wunused-macros]
  #define random lrand48
          ^
  Key.c:51:9: warning: macro is not used [-Wunused-macros]
  #define srandom srand48
          ^

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>