headers/time: Add `__MINGW_STRFTIME_FORMAT` for `strftime()`

This is exactly what we have done with `__MINGW_PRINTF_FORMAT` in `stdio.h`
for `*printf()` functions.

Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-headers/crt/time.h

diff --git a/mingw-w64-headers/crt/time.h b/mingw-w64-headers/crt/time.h
index b2a1631..473597e 100644
--- a/mingw-w64-headers/crt/time.h
+++ b/mingw-w64-headers/crt/time.h
@@ -132,6 +132,16 @@
   __MINGW_IMPORT char * _tzname[2];
 #endif
 
+#undef __MINGW_STRFTIME_FORMAT
+
+#if defined(__clang__)
+#define __MINGW_STRFTIME_FORMAT strftime
+#elif defined(_UCRT)
+#define __MINGW_STRFTIME_FORMAT gnu_strftime
+#else
+#define __MINGW_STRFTIME_FORMAT ms_strftime
+#endif
+
   _CRTIMP errno_t __cdecl _get_daylight(int *_Daylight);
   _CRTIMP errno_t __cdecl _get_dstbias(long *_Daylight_savings_bias);
   _CRTIMP errno_t __cdecl _get_timezone(long *_Timezone);
@@ -146,7 +156,7 @@
   _SECIMP errno_t __cdecl _gmtime32_s (struct tm *_Tm,const __time32_t *_Time);
   _CRTIMP struct tm *__cdecl _localtime32(const __time32_t *_Time) __MINGW_ATTRIB_DEPRECATED_SEC_WARN;
   _SECIMP errno_t __cdecl _localtime32_s (struct tm *_Tm,const __time32_t *_Time);
-  size_t __cdecl strftime(char * __restrict__ _Buf,size_t _SizeInBytes,const char * __restrict__ _Format,const struct tm * __restrict__ _Tm);
+  size_t __cdecl strftime(char * __restrict__ _Buf,size_t _SizeInBytes,const char * __restrict__ _Format,const struct tm * __restrict__ _Tm) __attribute__((__format__ (__MINGW_STRFTIME_FORMAT, 3, 0)));
   _CRTIMP size_t __cdecl _strftime_l(char * __restrict__ _Buf,size_t _Max_size,const char * __restrict__ _Format,const struct tm * __restrict__ _Tm,_locale_t _Locale);
   _CRTIMP char *__cdecl _strdate(char *_Buffer) __MINGW_ATTRIB_DEPRECATED_SEC_WARN;
   _SECIMP errno_t __cdecl _strdate_s (char *_Buf,size_t _SizeInBytes);