patch 9.0.0219: cannot make a funcref with "s:func" in a def function

Problem:    Cannot make a funcref with "s:func" in a def function in legacy
            script.
Solution:   Allow for using a lower case function name after "s:". (Kota Kato,
            closes #10926)
diff --git a/src/version.c b/src/version.c
index 5d9f9f7..3aff052 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    219,
+/**/
     218,
 /**/
     217,