patch 9.0.1294: the set_bool_option() function is too long

Problem:    The set_bool_option() function is too long.
Solution:   Move code to separate functions. (Yegappan Lakshmanan,
            closes #11964)
diff --git a/src/version.c b/src/version.c
index cc4345d..e3563c6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1294,
+/**/
     1293,
 /**/
     1292,