patch 9.1.0110: filetype: add 'Config.in' filetype detection

The 'Config.in' file type is for Buildroot configuration files.
Buildroot Config.in files use the same Kconfig backend as the Linux
kernel's Kconfig files.

Buildroot also has other filename variants that follow "Config.in.*",
they are used to distinguish multiple Config.in files in the same
directory.

See https://buildroot.org/downloads/manual/manual.html#_literal_config_in_literal_file

closes: #14038

Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/filetype.vim

@@ -1141,7 +1141,7 @@ au BufNewFile,BufRead *.kt,*.ktm,*.kts		setf kotlin
 au BufNewFile,BufRead *.ks			setf kscript
 
 " Kconfig
-au BufNewFile,BufRead Kconfig,Kconfig.debug	setf kconfig
+au BufNewFile,BufRead Kconfig,Kconfig.debug,Config.in	setf kconfig
 
 " Lace (ISE)
 au BufNewFile,BufRead *.ace,*.ACE		setf lace
@@ -2780,7 +2780,7 @@ au! BufNewFile,BufRead *jarg*
 au BufNewFile,BufRead *.properties_??_??_*	call s:StarSetf('jproperties')
 
 " Kconfig
-au BufNewFile,BufRead Kconfig.*			call s:StarSetf('kconfig')
+au BufNewFile,BufRead Kconfig.*,Config.in.*	call s:StarSetf('kconfig')
 
 " Lilo: Linux loader
 au BufNewFile,BufRead lilo.conf*		call s:StarSetf('lilo')

src/testdir/test_filetype.vim

@@ -357,7 +357,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     jsp: ['file.jsp'],
     julia: ['file.jl'],
     just: ['justfile', 'Justfile', '.justfile', 'config.just'],
-    kconfig: ['Kconfig', 'Kconfig.debug', 'Kconfig.file'],
+    kconfig: ['Kconfig', 'Kconfig.debug', 'Kconfig.file', 'Config.in', 'Config.in.host'],
     kdl: ['file.kdl'],
     kivy: ['file.kv'],
     kix: ['file.kix'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    110,
 /**/
     109,
 /**/