2976 remove useless offsetof() macros

*** 25,41 ****
   */
  
  #ifndef _MISC_H
  #define _MISC_H
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <sys/types.h>
  #include <sys/time.h>
  #include <thread.h>
  #include <pthread.h>
  #include <stdarg.h>
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
--- 25,40 ----
   */
  
  #ifndef _MISC_H
  #define _MISC_H
  
  #include <sys/types.h>
  #include <sys/time.h>
  #include <thread.h>
  #include <pthread.h>
  #include <stdarg.h>
+ #include <stddef.h>
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
*** 43,60 ****
  extern uint_t umem_output;              /* output error messages to stderr */
  extern caddr_t umem_min_stack;          /* max stack address for audit log */
  extern caddr_t umem_max_stack;          /* min stack address for audit log */
  
  /*
-  * various utility functions
-  * These are globally implemented.
-  */
- 
- #undef  offsetof
- #define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
- 
- /*
   * a safe printf  -- do not use for error messages.
   */
  void debug_printf(const char *format, ...);
  
  /*
--- 42,51 ----