In ncurses baudrate definitions, avoid warnings about implicit

conversions from int to short changing the values.  This applies to
B38400 and higher, since their values do not fit into a short.

However, since the wrapped values are still unique, and they only serve
as keys, there is no problem in adding a cast to silence the warnings.
This also avoids changing the ABI, which would happen if we changed
NCURSES_OSPEED to int.

Discussed with:	Thomas Dickey
MFC after:	1 week

contrib/ncurses/ncurses/tinfo/lib_baudrate.c

@@ -94,7 +94,7 @@ struct speed {
     int sp;			/* the actual speed */
 };
 
-#define DATA(number) { B##number, number }
+#define DATA(number) { (NCURSES_OSPEED)B##number, number }
 
 static struct speed const speeds[] =
 {