fix compilation warning on include
check whether it is defined or not, because __WORDSIZE can be undefined.
@@ -226,7 +226,7 @@ intmax_t wcstoimax(const wchar_t *, wchar_t **, int);
*/
uintmax_t wcstoumax(const wchar_t *, wchar_t **, int);
-#if __WORDSIZE == 64
+#if defined(__WORDSIZE) && __WORDSIZE == 64
#define __PRI64_PREFIX "l"
#define __PRIPTR_PREFIX "l"
#else
