patch 9.1.0674: Vim9: compiling abstract method fails because of missing return

Problem:  Vim9: compiling abstract method fails because of missing
          return (Aliaksei Budavei)
Solution: don't require a return statement for an abstract method when
          compiling (Ernie Rael)

fixes: #15432
closes: #15441

Signed-off-by: Ernie Rael <errael@raelity.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index edde65f..9bfca00 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    674,
+/**/
     673,
 /**/
     672,