2976 remove useless offsetof() macros

@@ -25,17 +25,16 @@
  */
 
 #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>
+#include <stddef.h>
 
 #ifdef  __cplusplus
 extern "C" {
 #endif
 

@@ -43,18 +42,10 @@
 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, ...);
 
 /*