patch 9.1.0286: Vim9: E1027 with defcompile for abstract methods

Problem:  Vim9: E1027 with defcompile for abstract methods with
          non-void return types, but still compiles it
          (zzzyxwvut)
Solution: Don't compile abstract methods
          (Yegappan Lakshmanan)

fixes: #14443
closes: #14447

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index d3fde43..4cece61 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    286,
+/**/
     285,
 /**/
     284,