patch 9.1.0880: filetype: C3 files are not recognized

Problem:  filetype: C3 files are not recognized
Solution: detect '*.c3*' files as c3 filetype (Turiiya)

closes: #16087

Signed-off-by: Turiiya <34311583+ttytm@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/filetype.vim

@@ -311,6 +311,9 @@ au BufNewFile,BufRead */.bundle/config			setf yaml
 au BufNewFile,BufRead *.c			call dist#ft#FTlpc()
 au BufNewFile,BufRead *.lpc,*.ulpc		setf lpc
 
+" C3
+au BufNewFile,BufRead *.c3,*.c3i,*.c3t		setf c3
+
 " Cairo
 au BufNewFile,BufRead *.cairo			setf cairo
 

src/testdir/test_filetype.vim

@@ -144,6 +144,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     bzl: ['file.bazel', 'file.bzl', 'WORKSPACE', 'WORKSPACE.bzlmod'],
     bzr: ['bzr_log.any', 'bzr_log.file'],
     c: ['enlightenment/file.cfg', 'file.qc', 'file.c', 'some-enlightenment/file.cfg', 'file.mdh', 'file.epro'],
+    c3: ['file.c3', 'file.c3i', 'file.c3t'],
     cabal: ['file.cabal'],
     cabalconfig: ['cabal.config', expand("$HOME/.config/cabal/config")] + WhenConfigHome('$XDG_CONFIG_HOME/cabal/config'),
     cabalproject: ['cabal.project', 'cabal.project.local'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    880,
 /**/
     879,
 /**/