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.

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    236,
 /**/
     235,
 /**/