headers: crt: move NULL to corecrt.h

Deduplicate and follow UCRT headers.

Signed-off-by: Zhongteng Gui <dragon-archer@outlook.com>
Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-headers/crt/corecrt.h

diff --git a/mingw-w64-headers/crt/corecrt.h b/mingw-w64-headers/crt/corecrt.h
index 2dd360f..c3f3a82 100644
--- a/mingw-w64-headers/crt/corecrt.h
+++ b/mingw-w64-headers/crt/corecrt.h
@@ -188,6 +188,18 @@
 #endif
 #endif
 
+#ifndef NULL
+#ifdef __cplusplus
+#ifndef _WIN64
+#define NULL 0
+#else
+#define NULL 0LL
+#endif  /* W64 */
+#else
+#define NULL ((void *)0)
+#endif
+#endif
+
 #if defined(__LIBMSVCRT__)
 /* When building mingw-w64, this should be blank.  */
 #define _SECIMP

mingw-w64-headers/crt/corecrt_wstdio.h

diff --git a/mingw-w64-headers/crt/corecrt_wstdio.h b/mingw-w64-headers/crt/corecrt_wstdio.h
index ffc808a..2779981 100644
--- a/mingw-w64-headers/crt/corecrt_wstdio.h
+++ b/mingw-w64-headers/crt/corecrt_wstdio.h
@@ -42,18 +42,6 @@
 #define stdout (__acrt_iob_func(1))
 #define stderr (__acrt_iob_func(2))
 
-#ifndef NULL
-#ifdef __cplusplus
-#ifndef _WIN64
-#define NULL 0
-#else
-#define NULL 0LL
-#endif  /* W64 */
-#else
-#define NULL ((void *)0)
-#endif
-#endif
-
 #if __MINGW_FORTIFY_LEVEL > 0
 __mingw_bos_declare;
 #endif

mingw-w64-headers/crt/crtdbg.h

diff --git a/mingw-w64-headers/crt/crtdbg.h b/mingw-w64-headers/crt/crtdbg.h
index 1e9136e..f25fcba 100644
--- a/mingw-w64-headers/crt/crtdbg.h
+++ b/mingw-w64-headers/crt/crtdbg.h
@@ -11,18 +11,6 @@
 
 _CRT_BEGIN_C_HEADER
 
-#ifndef NULL
-#ifdef __cplusplus
-#ifndef _WIN64
-#define NULL 0
-#else
-#define NULL 0LL
-#endif  /* W64 */
-#else
-#define NULL ((void *)0)
-#endif
-#endif
-
   typedef void *_HFILE;
 
 #define _CRT_WARN 0

mingw-w64-headers/crt/locale.h

diff --git a/mingw-w64-headers/crt/locale.h b/mingw-w64-headers/crt/locale.h
index e767e28..c7a6d30 100644
--- a/mingw-w64-headers/crt/locale.h
+++ b/mingw-w64-headers/crt/locale.h
@@ -14,18 +14,6 @@
 
 _CRT_BEGIN_C_HEADER
 
-#ifndef NULL
-#ifdef __cplusplus
-#ifndef _WIN64
-#define NULL 0
-#else
-#define NULL 0LL
-#endif  /* W64 */
-#else
-#define NULL ((void *)0)
-#endif
-#endif
-
 /**
  * Internal CRT stuff.
  */

mingw-w64-headers/crt/setjmp.h

diff --git a/mingw-w64-headers/crt/setjmp.h b/mingw-w64-headers/crt/setjmp.h
index a725572..49e29a0 100644
--- a/mingw-w64-headers/crt/setjmp.h
+++ b/mingw-w64-headers/crt/setjmp.h
@@ -10,18 +10,6 @@
 
 _CRT_BEGIN_C_HEADER
 
-#ifndef NULL
-#ifdef __cplusplus
-#ifndef _WIN64
-#define NULL 0
-#else
-#define NULL 0LL
-#endif  /* W64 */
-#else
-#define NULL ((void *)0)
-#endif
-#endif
-
 #if defined(__i386__)
 
 #define _JBLEN 16

mingw-w64-headers/crt/stdlib.h

diff --git a/mingw-w64-headers/crt/stdlib.h b/mingw-w64-headers/crt/stdlib.h
index 45ee016..f750e15 100644
--- a/mingw-w64-headers/crt/stdlib.h
+++ b/mingw-w64-headers/crt/stdlib.h
@@ -12,18 +12,6 @@
 
 _CRT_BEGIN_C_HEADER
 
-#ifndef NULL
-#ifdef __cplusplus
-#ifndef _WIN64
-#define NULL 0
-#else
-#define NULL 0LL
-#endif  /* W64 */
-#else
-#define NULL ((void *)0)
-#endif
-#endif
-
 #define EXIT_SUCCESS 0
 #define EXIT_FAILURE 1
 

mingw-w64-headers/crt/string.h

diff --git a/mingw-w64-headers/crt/string.h b/mingw-w64-headers/crt/string.h
index b629da2..7aece72 100644
--- a/mingw-w64-headers/crt/string.h
+++ b/mingw-w64-headers/crt/string.h
@@ -19,18 +19,6 @@
 
 #define _NLSCMPERROR 2147483647
 
-#ifndef NULL
-#ifdef __cplusplus
-#ifndef _WIN64
-#define NULL 0
-#else
-#define NULL 0LL
-#endif  /* W64 */
-#else
-#define NULL ((void *)0)
-#endif
-#endif
-
   char * __cdecl _strset(char *_Str,int _Val) __MINGW_ATTRIB_DEPRECATED_SEC_WARN;
   char * __cdecl _strset_l(char *_Str,int _Val,_locale_t _Locale) __MINGW_ATTRIB_DEPRECATED_SEC_WARN;
   char * __cdecl strcpy(char * __restrict__ _Dest,const char * __restrict__ _Source);

mingw-w64-headers/crt/tchar.h

diff --git a/mingw-w64-headers/crt/tchar.h b/mingw-w64-headers/crt/tchar.h
index e3a7a87..09f5205 100644
--- a/mingw-w64-headers/crt/tchar.h
+++ b/mingw-w64-headers/crt/tchar.h
@@ -1352,18 +1352,6 @@
 
 #define _istlegal(_c) (1)
 
-#ifndef NULL
-#ifdef __cplusplus
-#ifndef _WIN64
-#define NULL 0
-#else
-#define NULL 0LL
-#endif  /* W64 */
-#else
-#define NULL ((void *)0)
-#endif
-#endif
-
 #define _strdec(_cpc1,_cpc2) ((_cpc1)>=(_cpc2) ? NULL : (_cpc2)-1)
 #define _strinc(_pc) ((_pc)+1)
 #define _strnextc(_cpc) ((unsigned int) *(const unsigned char *)(_cpc))

mingw-w64-headers/crt/time.h

diff --git a/mingw-w64-headers/crt/time.h b/mingw-w64-headers/crt/time.h
index b0e8cee..2a8e392 100644
--- a/mingw-w64-headers/crt/time.h
+++ b/mingw-w64-headers/crt/time.h
@@ -23,18 +23,6 @@
   typedef long clock_t;
 #endif
 
-#ifndef NULL
-#ifdef __cplusplus
-#ifndef _WIN64
-#define NULL 0
-#else
-#define NULL 0LL
-#endif  /* W64 */
-#else
-#define NULL ((void *)0)
-#endif
-#endif
-
 #define CLOCKS_PER_SEC 1000
 
 #ifdef _UCRT