message: Add rusage constants
diff: @@ -9,6 +9,11 @@ extern crate sys_time;
  use platform::types::*;
  use sys_time::timeval;
  +pub const RUSAGE_SELF: c_int = 0;
  +pub const RUSAGE_CHILDREN: c_int = -1;
  +pub const RUSAGE_BOTH: c_int = -2;
  +pub const RUSAGE_THREAD: c_int = 1;
  +
  type rlim_t = u64;
  #[repr(C)]
  