msvcrt: Print assertion failure messages to stderr.

dlls/msvcrt/exit.c

@@ -305,7 +305,7 @@ void CDECL MSVCRT__wassert(const MSVCRT_wchar_t* str, const MSVCRT_wchar_t* file
     DoMessageBoxW(assertion_failed, text);
   }
   else
-    _cwprintf(format_console, str, file, line);
+    MSVCRT_fwprintf(MSVCRT_stderr, format_console, str, file, line);
 
   MSVCRT_raise(MSVCRT_SIGABRT);
   MSVCRT__exit(3);

dlls/msvcrt/msvcrt.h

@@ -447,6 +447,8 @@ struct MSVCRT__iobuf {
 
 typedef struct MSVCRT__iobuf MSVCRT_FILE;
 
+extern MSVCRT_FILE MSVCRT__iob[];
+
 struct MSVCRT_lconv {
     char* decimal_point;
     char* thousands_sep;
@@ -1107,6 +1109,7 @@ MSVCRT___time32_t __cdecl MSVCRT__time32(MSVCRT___time32_t*);
 MSVCRT___time64_t __cdecl MSVCRT__time64(MSVCRT___time64_t*);
 MSVCRT_FILE*   __cdecl MSVCRT__fdopen(int, const char *);
 MSVCRT_FILE*   __cdecl MSVCRT__wfdopen(int, const MSVCRT_wchar_t *);
+int            WINAPIV MSVCRT_fwprintf(MSVCRT_FILE *file, const MSVCRT_wchar_t *format, ...);
 int            __cdecl MSVCRT_vsnprintf(char *str, MSVCRT_size_t len, const char *format, __ms_va_list valist);
 int            __cdecl MSVCRT_vsnwprintf(MSVCRT_wchar_t *str, MSVCRT_size_t len,
                                        const MSVCRT_wchar_t *format, __ms_va_list valist );

dlls/msvcrt/scanf.c

@@ -35,8 +35,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
-extern MSVCRT_FILE MSVCRT__iob[];
-
 /* helper function for *scanf.  Returns the value of character c in the
  * given base, or -1 if the given character is not a digit of the base.
  */