patch 9.1.1501: filetype: flix files are not recognized

Problem:  filetype: flix files are not recognized
Solution: detect *.flix files as flix filetype
          (0xadk)

References:
- https://flix.dev/
- https://doc.flix.dev/introduction.html

closes: #17646

Signed-off-by: 0xadk <0xadk@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1501,
 /**/
     1500,
 /**/