patch 9.1.0304: filetype: cgdb config file is not recognized

Problem:  filetype: cgdb config file is not recognized
Solution: Detect cgdbrc files as cgdbrc filetype
          (Wu, Zhenyu)

closes: #14458

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 65b5bd5..b313d16 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    304,
+/**/
     303,
 /**/
     302,