patch 8.0.1833: X11: ":echo 3.14" gives E806

Problem:    X11: ":echo 3.14" gives E806.
Solution:   set LC_NUMERIC to "C". (Dominique Pelle, closes #2368)
diff --git a/src/version.c b/src/version.c
index 080ba72..e19b180 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1833,
+/**/
     1832,
 /**/
     1831,