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',