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libc: Add sys/cdefs.h

This new header contains all the common definitions of the
system in only one file. It makes easier to port to
new systems and to fix errors.

--- a/include/locale.h

+++ b/include/locale.h

@@ -2,6 +2,7 @@

 #define _LOCALE_H

 #define _NEED_NULL

+#include <sys/cdefs.h>

 #include <arch/cdefs.h>

 #define LC_ALL      0

--- a/include/stddef.h

+++ b/include/stddef.h

@@ -5,6 +5,7 @@

 #define _NEED_WCHAR_T

 #define _NEED_PTRDIFFT

 #define _NEED_NULL

+#include <sys/cdefs.h>

 #include <arch/cdefs.h>

 #define offsetof(st, m) ((size_t)&(((st *)0)->m))

--- a/include/stdlib.h

+++ b/include/stdlib.h

@@ -4,6 +4,7 @@

 #define _NEED_NULL

 #define _NEED_SIZET

 #define _NEED_WCHART

+#include <sys/cdefs.h>

 #include <arch/cdefs.h>

 #include <arch/stdlib.h>

--- a/include/string.h

+++ b/include/string.h

@@ -3,6 +3,7 @@

 #define _NEED_SIZET

 #define _NEED_NULL

+#include <sys/cdefs.h>

 #include <arch/cdefs.h>

 #include <arch/string.h>

--- a/include/time.h

+++ b/include/time.h

@@ -3,6 +3,7 @@

 #define _NEED_SIZET

 #define _NEED_NULL

+#include <sys/cdefs.h>

 #include <arch/cdefs.h>

 #include <arch/time.h>