patch 8.2.1833: when reading from stdin dup() is called twice

Problem:    When reading from stdin dup() is called twice.
Solution:   Remove the dup() in main.c. (Ken Takata, closes #7110)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1833,
 /**/
     1832,
 /**/