patch 8.2.0980: raku file extension not recognized

Problem:    Raku file extension not recognized. (Steven Penny)
Solution:   Recognize .raku and .rakumod. (closes #6255)

runtime/filetype.vim

@@ -1166,6 +1166,7 @@ else
 endif
 au BufNewFile,BufRead *.plx,*.al,*.psgi		setf perl
 au BufNewFile,BufRead *.p6,*.pm6,*.pl6		setf perl6
+au BufNewFile,BufRead *.raku,*.rakumod		setf perl6
 
 " Perl, XPM or XPM2
 au BufNewFile,BufRead *.pm

src/testdir/test_filetype.vim

@@ -330,7 +330,7 @@ let s:filename_checks = {
     \ 'pccts': ['file.g'],
     \ 'pdf': ['file.pdf'],
     \ 'perl': ['file.plx', 'file.al', 'file.psgi', 'gitolite.rc', '.gitolite.rc', 'example.gitolite.rc'],
-    \ 'perl6': ['file.p6', 'file.pm6', 'file.pl6'],
+    \ 'perl6': ['file.p6', 'file.pm6', 'file.pl6', 'file.raku', 'file.rakumod'],
     \ 'pf': ['pf.conf'],
     \ 'pfmain': ['main.cf'],
     \ 'php': ['file.php', 'file.php9', 'file.phtml', 'file.ctp'],

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    980,
 /**/
     979,
 /**/