shlwapi: sync wsprintf implementaiton from user32

[Austin English]

For https://bugs.winehq.org/show_bug.cgi?id=35369

-- 
-Austin
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diff --git a/dlls/shlwapi/wsprintf.c b/dlls/shlwapi/wsprintf.c
index 56eea41..6a36b6a 100644
--- a/dlls/shlwapi/wsprintf.c
+++ b/dlls/shlwapi/wsprintf.c
@@ -327,7 +327,7 @@ INT WINAPI wvnsprintfA( LPSTR buffer, INT maxlen, LPCSTR spec, __ms_va_list args
     WPRINTF_FORMAT format;
     LPSTR p = buffer;
     UINT i, len, sign;
-    CHAR number[20];
+    CHAR number[21]; /* 64bit number can be 18446744073709551616 which is 20 chars. and a \0 */
     WPRINTF_DATA argData;
 
     TRACE("%p %u %s\n", buffer, maxlen, debugstr_a(spec));
@@ -434,7 +434,7 @@ INT WINAPI wvnsprintfW( LPWSTR buffer, INT maxlen, LPCWSTR spec, __ms_va_list ar
     WPRINTF_FORMAT format;
     LPWSTR p = buffer;
     UINT i, len, sign;
-    CHAR number[20];
+    CHAR number[21]; /* 64bit number can be 18446744073709551616 which is 20 chars. and a \0 */
     WPRINTF_DATA argData;
 
     TRACE("%p %u %s\n", buffer, maxlen, debugstr_w(spec));