vim-patch:8.2.5054: no good filetype for conf files similar to dosini (#18851)

Problem:    No good filetype for conf files similar to dosini.
Solution:   Add the confini filetype. (closes vim/vim#10510)
635f48010d

runtime/filetype.vim

@@ -1303,8 +1303,8 @@ au BufNewFile,BufRead *.org,*.org_archive	setf org
 " Packet filter conf
 au BufNewFile,BufRead pf.conf				setf pf
 
-" Pacman config
-au BufNewFile,BufRead */etc/pacman.conf		setf conf
+" ini style config files, using # comments
+au BufNewFile,BufRead */etc/pacman.conf,mpv.conf	setf confini
 
 " Pacman hooks
 au BufNewFile,BufRead *.hook

runtime/lua/vim/filetype.lua

@@ -1230,9 +1230,10 @@ local filename = {
   Dockerfile = 'dockerfile',
   npmrc = 'dosini',
   ['/etc/yum.conf'] = 'dosini',
-  ['/etc/pacman.conf'] = 'conf',
   ['.npmrc'] = 'dosini',
   ['.editorconfig'] = 'dosini',
+  ['/etc/pacman.conf'] = 'confini',
+  ['mpv.conf'] = 'confini',
   dune = 'dune',
   jbuild = 'dune',
   ['dune-workspace'] = 'dune',
@@ -1558,7 +1559,7 @@ local pattern = {
   ['.*/etc/DIR_COLORS'] = 'dircolors',
   ['.*/etc/dnsmasq%.conf'] = 'dnsmasq',
   ['php%.ini%-.*'] = 'dosini',
-  ['.*/etc/pacman%.conf'] = 'conf',
+  ['.*/etc/pacman%.conf'] = 'confini',
   ['.*/etc/yum%.conf'] = 'dosini',
   ['.*lvs'] = 'dracula',
   ['.*lpe'] = 'dracula',

src/nvim/testdir/test_filetype.vim

@@ -114,8 +114,9 @@ let s:filename_checks = {
     \ 'cobol': ['file.cbl', 'file.cob', 'file.lib'],
     \ 'coco': ['file.atg'],
     \ 'conaryrecipe': ['file.recipe'],
-    \ 'conf': ['/etc/pacman.conf', 'any/etc/pacman.conf', 'auto.master'],
+    \ 'conf': ['auto.master'],
     \ 'config': ['configure.in', 'configure.ac', '/etc/hostname.file'],
+    \ 'confini': ['/etc/pacman.conf', 'any/etc/pacman.conf', 'mpv.conf'],
     \ 'context': ['tex/context/any/file.tex', 'file.mkii', 'file.mkiv', 'file.mkvi', 'file.mkxl', 'file.mklx'],
     \ 'cook': ['file.cook'],
     \ 'cpp': ['file.cxx', 'file.c++', 'file.hh', 'file.hxx', 'file.hpp', 'file.ipp', 'file.moc', 'file.tcc', 'file.inl', 'file.tlh'],