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)
diff --git a/src/version.c b/src/version.c
index 6368b5e..4361345 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1833,
+/**/
     1832,
 /**/
     1831,