patch 9.0.0798: clang format configuration files are not recognized

Problem:    Clang format configuration files are not recognized.
Solution:   Use yaml for Clang format configuration files. (Marwin Glaser,
            closes #11398)

runtime/filetype.vim

@@ -369,6 +369,9 @@ au BufNewFile,BufRead *.ch			call dist#ft#FTchange()
 " ChordPro
 au BufNewFile,BufRead *.chopro,*.crd,*.cho,*.crdpro,*.chordpro	setf chordpro
 
+" Clang-format
+au BufNewFile,BufRead .clang-format		setf yaml
+
 " Clang-tidy
 au BufNewFile,BufRead .clang-tidy		setf yaml
 

src/testdir/test_filetype.vim

@@ -641,7 +641,7 @@ let s:filename_checks = {
     \ 'xsd': ['file.xsd'],
     \ 'xslt': ['file.xsl', 'file.xslt'],
     \ 'yacc': ['file.yy', 'file.yxx', 'file.y++'],
-    \ 'yaml': ['file.yaml', 'file.yml', '.clang-tidy'],
+    \ 'yaml': ['file.yaml', 'file.yml', '.clang-format', '.clang-tidy'],
     \ 'yang': ['file.yang'],
     \ 'z8a': ['file.z8a'],
     \ 'zig': ['file.zig'],

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    798,
 /**/
     797,
 /**/