patch 9.0.1807: runtime: crystal scripts not recognised

Problem:  runtime: crystal scripts not recognised
Solution: Filetype detect Crystal scripts by shebang line

closes: #12935

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Doug Kearns <dougkearns@gmail.com>

src/testdir/test_filetype.vim

@@ -944,6 +944,7 @@ def s:GetScriptChecks(): dict<list<list<string>>>
     fish:   [['#!/path/fish']],
     forth:  [['#!/path/gforth']],
     icon:   [['#!/path/icon']],
+    crystal: [['#!/path/crystal']],
   }
 enddef
 

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1807,
 /**/
     1806,
 /**/