vim-patch:9.2.0589: filetype: xinitrc files are not recognized (#40102)

Problem:  filetype: xinitrc files are not recognized
Solution: Detect xinitrc and xserverrc files as sh filetype
          (Enrico Maria De Angelis)

Reference:
https://wiki.archlinux.org/title/Xinit#Configuration

closes: vim/vim#20419

5b76ddcc52

Co-authored-by: Enrico Maria De Angelis <enricomaria.dean6elis@gmail.com>

runtime/lua/vim/filetype.lua

@@ -2165,6 +2165,9 @@ local pattern = {
     ['/etc/serial%.conf$'] = 'setserial',
     ['/etc/udev/cdsymlinks%.conf$'] = 'sh',
     ['/etc/profile$'] = detect.sh,
+    ['^/etc/X11/xinit/xinitrc$'] = 'sh',
+    ['^/etc/X11/xinit/xinitrc%.d/'] = 'sh',
+    ['^/etc/X11/xinit/xserverrc$'] = 'sh',
     ['/etc/slp%.conf$'] = 'slpconf',
     ['/etc/slp%.reg$'] = 'slpreg',
     ['/etc/slp%.spi$'] = 'slpspi',
@@ -2528,6 +2531,8 @@ local pattern = {
     ['/%.icewm/menu$'] = 'icemenu',
     ['/%.libao$'] = 'libao',
     ['/%.pinforc$'] = 'pinfo',
+    ['^${HOME}/%.xinitrc$'] = 'sh',
+    ['^${HOME}/%.xserverrc$'] = 'sh',
     ['/%.cargo/credentials$'] = 'toml',
     ['/%.init/.*%.override$'] = 'upstart',
     ['/%.kube/kuberc$'] = 'yaml',

test/old/testdir/test_filetype.vim

@@ -745,7 +745,7 @@ func s:GetFilenameChecks() abort
     \        '/tmp/bash-fc-3Ozjlw', '/tmp/bash-fc.3Ozjlw', 'PKGBUILD', 'file.bash', '/usr/share/doc/bash-completion/filter.sh',
     \        '/etc/udev/cdsymlinks.conf', 'any/etc/udev/cdsymlinks.conf', 'file.bats', '.ash_history', 'any/etc/neofetch/config.conf', '.xprofile',
     \        'user-dirs.defaults', 'user-dirs.dirs', 'makepkg.conf', '.makepkg.conf', 'file.mdd', 'file.cygport', '.envrc', '.envrc.file', 'file.envrc', 'devscripts.conf',
-    \        '.devscripts', 'file.lo', 'file.la', 'file.lai'],
+    \        '.devscripts', 'file.lo', 'file.la', 'file.lai', '/etc/X11/xinit/xinitrc', '/etc/X11/xinit/xserverrc', '~/.xinitrc', '/etc/X11/xinit/xinitrc.d/foobar'],
     \ 'shaderslang': ['file.slang'],
     \ 'sieve': ['file.siv', 'file.sieve'],
     \ 'sil': ['file.sil'],