patch 9.1.0266: filetype: earthfile files are not recognized

Problem:  filetype: earthfile files are not recognized
Solution: Detect 'Earthfile' as earthfile
          (Gaëtan Lehmann)

closes: #14408

Signed-off-by: Gaëtan Lehmann <gaetan.lehmann@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/filetype.vim

@@ -665,6 +665,9 @@ au BufNewFile,BufRead *.dtd			setf dtd
 " DTS/DSTI/DTSO (device tree files)
 au BufNewFile,BufRead *.dts,*.dtsi,*.dtso,*.its	setf dts
 
+" Earthfile
+au BufNewFile,BufRead Earthfile			setf earthfile
+
 " EDIF (*.edf,*.edif,*.edn,*.edo) or edn
 au BufNewFile,BufRead *.ed\(f\|if\|o\)		setf edif
 au BufNewFile,BufRead *.edn

src/testdir/test_filetype.vim

@@ -220,6 +220,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     dylan: ['file.dylan'],
     dylanintr: ['file.intr'],
     dylanlid: ['file.lid'],
+    earthfile: ['Earthfile'],
     ecd: ['file.ecd'],
     edif: ['file.edf', 'file.edif', 'file.edo'],
     editorconfig: ['.editorconfig'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    266,
 /**/
     265,
 /**/