Code review comments from jeffpc

*** 20,30 ****
  
  #include <sys/types.h>
  #include <sys/procset.h>
  
  struct proc;
! typedef uint32_t secflagset_t;
  
  typedef struct psecflags {
          secflagset_t psf_effective;
          secflagset_t psf_inherit;
          secflagset_t psf_lower;
--- 20,30 ----
  
  #include <sys/types.h>
  #include <sys/procset.h>
  
  struct proc;
! typedef uint64_t secflagset_t;
  
  typedef struct psecflags {
          secflagset_t psf_effective;
          secflagset_t psf_inherit;
          secflagset_t psf_lower;