patch 8.0.1633: a TextChanged autocmd triggers when it is defined

Problem:    A TextChanged autocmd triggers when it is defined after creating a
            buffer.
Solution:   Set b_last_changedtick when opening a buffer. (Hirohito Highlight,
            closes #2742)

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1633,
 /**/
     1632,
 /**/