Code review comments from jeffpc

@@ -401,10 +401,11 @@
 
 #define PRSECFLAGS_VERSION_1            1
 #define PRSECFLAGS_VERSION_CURRENT      PRSECFLAGS_VERSION_1
 typedef struct prsecflags {
         uint32_t pr_version;
+        char pr_pad[4];
         secflagset_t pr_effective;
         secflagset_t pr_inherit;
         secflagset_t pr_lower;
         secflagset_t pr_upper;
 } prsecflags_t;