patch 9.1.1517: filetype: autopkgtest files are not recognized

Problem:  filetype: autopkgtest files are not recognized
Solution: detect */debian/tests/control files as autopkgtest filetype
          (James McCoy)

Autopkgtest is a Debian tool for testing installed versions of packages
when other, related packages are updated.

Reference:
- https://www.debian.org/doc/debian-policy/autopkgtest.txt

related: #17679

Signed-off-by: James McCoy <jamessan@jamessan.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_filetype.vim

@@ -125,6 +125,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     autohotkey: ['file.ahk'],
     autoit: ['file.au3'],
     automake: ['GNUmakefile.am', 'makefile.am', 'Makefile.am'],
+    autopkgtest: ['/debian/tests/control', 'any/debian/tests/control'],
     ave: ['file.ave'],
     awk: ['file.awk', 'file.gawk'],
     b: ['file.mch', 'file.ref', 'file.imp'],

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1517,
 /**/
     1516,
 /**/