Avoid duplicate type definitions, especially wchar_t which was inconsstent and caused trouble in libarchive

include/stdlib.h

@@ -7,6 +7,7 @@
 #include <ansi.h>
 #endif
 
+#include <stddef.h>
 #include <sys/null.h>
 
 #define EXIT_FAILURE       1	/* standard error return using exit() */
@@ -17,16 +18,7 @@
 typedef struct { int quot, rem; } div_t;
 typedef struct { long quot, rem; } ldiv_t;
 
-/* The types are size_t, wchar_t, div_t, and ldiv_t. */
-#ifndef _SIZE_T
-#define _SIZE_T
-typedef unsigned int size_t;	/* type returned by sizeof */
-#endif
-
-#ifndef _WCHAR_T
-#define _WCHAR_T
-typedef char wchar_t;		/* type expanded character set */
-#endif
+/* The types are div_t, and ldiv_t. */
 
 /* Function Prototypes. */
 _PROTOTYPE( void abort, (void)						);

include/wchar.h

@@ -58,6 +58,7 @@
 
 #include <ansi.h>
 #include <stdarg.h>
+#include <stddef.h>
 
 #include <stdio.h> /* for FILE* */
 
@@ -70,11 +71,6 @@ typedef union {
     char __mbstate8[128];
 } __mbstate_t;
 
-#ifndef	_WCHAR_T
-#define	_WCHAR_T
-typedef	int wchar_t;
-#endif
-
 #ifndef	_MBSTATE_T
 #define	_MBSTATE_T
 typedef	__mbstate_t mbstate_t;
@@ -87,11 +83,6 @@ typedef	int wint_t;
 #endif
 
 
-#ifndef _SIZE_T
-#define _SIZE_T
-typedef unsigned int size_t;	/* type returned by sizeof */
-#endif
-
 struct tm;
 
 #ifdef __ACK__

include/wctype.h

@@ -30,29 +30,14 @@
 #define	_WCTYPE_H_
 
 #include <ansi.h>
-
-#ifndef	_WCHAR_T
-#define	_WCHAR_T
-typedef	int wchar_t;
-#endif
+#include <stddef.h>
+#include <wchar.h>
 
 #ifndef	_WCTYPE_T
 #define	_WCTYPE_T
 typedef	void *wctype_t;
 #endif
 
-#ifndef	_WINT_T
-#define	_WINT_T
-typedef	int wint_t;
-#endif
-
-
-#ifndef _SIZE_T
-#define _SIZE_T
-typedef unsigned int size_t;	/* type returned by sizeof */
-#endif
-
-
 #ifndef	_WCTRANS_T
 #define	_WCTRANS_T
 typedef	void *wctrans_t;

servers/iso9660fs/const.h

@@ -62,8 +62,6 @@
 
 #define END_OF_FILE   (-104)	/* eof detected */
 
-#define	offsetof(type, field)	((size_t)(&((type *)0)->field))
-
 /* Miscellaneous constants */
 #define SYS_UID  ((uid_t) 0)	/* uid_t for processes PM and INIT */
 #define SYS_GID  ((gid_t) 0)	/* gid_t for processes PM and INIT */