patch 8.0.0236: gcc complains about uninitialized variable

Problem:    Gcc complains that a variable may be used uninitialized. Confusion
            between variable and label name. (John Marriott)
Solution:   Initialize it.  Rename end to end_lnum.
diff --git a/src/version.c b/src/version.c
index 65208d0..684a244 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    236,
+/**/
     235,
 /**/
     234,