patch 8.0.0898: can't use the alternate screen in a terminal window

Problem:    Can't use the alternate screen in a terminal window.
Solution:   Initialze the alternate screen. (Yasuhiro Matsumoto, closes
            #1957)  Add term_getaltscreen().

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    898,
 /**/
     897,
 /**/