vim-patch:9.1.1320: filetype: alsoft config files are not recognized

Problem:  filetype: alsoft config files are not recognized
Solution: detect alsoft config files as dosini filetype
          (David Mandelberg)

References:
* code with paths to config: ReadALConfig() in
  https://github.com/kcat/openal-soft/blob/master/alc/alconfig.cpp
* example config:
  https://github.com/kcat/openal-soft/blob/master/alsoftrc.sample

closes: vim/vim#17140

1d96caaa4b

Co-authored-by: David Mandelberg <david@mandelberg.org>

runtime/lua/vim/filetype.lua

@@ -1548,6 +1548,10 @@ local filename = {
   ['nfs.conf'] = 'dosini',
   ['nfsmount.conf'] = 'dosini',
   ['.notmuch-config'] = 'dosini',
+  ['.alsoftrc'] = 'dosini',
+  ['alsoft.conf'] = 'dosini',
+  ['alsoft.ini'] = 'dosini',
+  ['alsoftrc.sample'] = 'dosini',
   ['pacman.conf'] = 'confini',
   ['paru.conf'] = 'confini',
   ['mpv.conf'] = 'confini',

test/old/testdir/test_filetype.vim

@@ -239,7 +239,9 @@ func s:GetFilenameChecks() abort
     \            '.coveragerc', '.pypirc', '.gitlint', '.oelint.cfg', 'pylintrc', '.pylintrc',
     \            '/home/user/.config/bpython/config', '/home/user/.config/mypy/config', '.wakatime.cfg', '.replyrc',
     \            'psprint.conf', 'sofficerc', 'any/.config/lxqt/globalkeyshortcuts.conf', 'any/.config/screengrab/screengrab.conf',
-    \            'any/.local/share/flatpak/repo/config', '.notmuch-config', '.notmuch-config.myprofile',
+    \            'any/.local/share/flatpak/repo/config',
+    \            '.alsoftrc', 'alsoft.conf', 'alsoft.ini', 'alsoftrc.sample',
+    \            '.notmuch-config', '.notmuch-config.myprofile',
     \            '~/.config/notmuch/myprofile/config'] + s:WhenConfigHome('$XDG_CONFIG_HOME/notmuch/myprofile/config'),
     \ 'dot': ['file.dot', 'file.gv'],
     \ 'dracula': ['file.drac', 'file.drc', 'file.lvs', 'file.lpe', 'drac.file'],