patch 9.1.0306: filetype: x11vnc config file is not recognized

Problem:  filetype: x11vnc config file is not recognized
Solution: Detect '.x11vncrc' as conf filetype
          (Wu, Zhenyu)

See: https://linux.die.net/man/1/x11vnc

closes: #14511

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 7310309..a7a9664 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    306,
+/**/
     305,
 /**/
     304,