Fix Bug#16021177 DICT_LOAD_FOREIGNS() PASSES UNALIGNED MEMORY TO

DTUPLE_CREATE_FROM_MEM()

Align to word-size the memory occupied by tuple_buf[] memory chunk.
I confirm that this change fixes the SIGBUS on Solaris.

Approved by:	Marko (via IM)

storage/innobase/dict/dict0load.c

@@ -2328,7 +2328,8 @@ dict_load_foreigns(
 	ibool		check_charsets)	/*!< in: TRUE=check charset
 					compatibility */
 {
-	char		tuple_buf[DTUPLE_EST_ALLOC(1)];
+	ulint		tuple_buf[(DTUPLE_EST_ALLOC(1) + sizeof(ulint) - 1)
+				/ sizeof(ulint)];
 	btr_pcur_t	pcur;
 	dtuple_t*	tuple;
 	dfield_t*	dfield;