patch 9.1.0492: filetype: Vim-script files not detected by shebang line

Problem:  Vim-script files may not be recognised
Solution: Add shebang line detection (Doug Kearns)

closes: #15012

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index c43eda7..d0a078f 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -994,6 +994,7 @@
             ['#!/path/regina']],
     janet:  [['#!/path/janet']],
     dart:   [['#!/path/dart']],
+    vim:    [['#!/path/vim']],
   }
 enddef
 
diff --git a/src/version.c b/src/version.c
index 5f7ea4c..abfcf3f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    492,
+/**/
     491,
 /**/
     490,