wchar.h and stdlib.h: __USE_MINGW_ANSI_STDIO check should be against the value, not against the existence of the macro.

mingw-w64-headers/crt/stdlib.h

diff --git a/mingw-w64-headers/crt/stdlib.h b/mingw-w64-headers/crt/stdlib.h
index 268ab84..e38d481 100644
--- a/mingw-w64-headers/crt/stdlib.h
+++ b/mingw-w64-headers/crt/stdlib.h
@@ -9,7 +9,7 @@
 #include <crtdefs.h>
 #include <limits.h>
 
-#if defined (__USE_MINGW_ANSI_STDIO) && !defined (__USE_MINGW_STRTOX)
+#if defined (__USE_MINGW_ANSI_STDIO) && ((__USE_MINGW_ANSI_STDIO + 0) != 0) && !defined (__USE_MINGW_STRTOX)
 #define __USE_MINGW_STRTOX 1
 #endif
 

mingw-w64-headers/crt/wchar.h

diff --git a/mingw-w64-headers/crt/wchar.h b/mingw-w64-headers/crt/wchar.h
index 0ba6131..3fbd17f 100644
--- a/mingw-w64-headers/crt/wchar.h
+++ b/mingw-w64-headers/crt/wchar.h
@@ -9,7 +9,7 @@
 #include <crtdefs.h>
 #include <_mingw_print_push.h>
 
-#if defined (__USE_MINGW_ANSI_STDIO) && !defined (__USE_MINGW_STRTOX)
+#if defined (__USE_MINGW_ANSI_STDIO) && ((__USE_MINGW_ANSI_STDIO + 0) != 0) && !defined (__USE_MINGW_STRTOX)
 #define __USE_MINGW_STRTOX 1
 #endif
 
@@ -775,7 +775,7 @@
   float __cdecl __mingw_wcstof(const wchar_t * __restrict__ nptr, wchar_t ** __restrict__ endptr);
   long double __cdecl __mingw_wcstold(const wchar_t * __restrict__, wchar_t ** __restrict__);
 
-#if defined(__USE_MINGW_ANSI_STDIO)
+#if __USE_MINGW_ANSI_STDIO
   __mingw_ovr
   double __cdecl wcstod(const wchar_t * __restrict__ _Str,wchar_t ** __restrict__ _EndPtr){
     return __mingw_wcstod(_Str,_EndPtr);