patch 9.0.1229: Cap'n Proto files are not recognized

Problem:    Cap'n Proto files are not recognized.
Solution:   Add a pattern and the "capnp" filetype. (Amaan Qureshi,
            closes #11862)

runtime/filetype.vim

@@ -277,6 +277,9 @@ au BufNewFile,BufRead *.lpc,*.ulpc		setf lpc
 " Calendar
 au BufNewFile,BufRead calendar			setf calendar
 
+" Cap'n Proto
+au BufNewFile,BufRead *.capnp			setf capnp
+
 " C#
 au BufNewFile,BufRead *.cs,*.csx		setf cs
 

src/testdir/test_filetype.vim

@@ -96,6 +96,7 @@ let s:filename_checks = {
     \ 'cabalconfig': ['cabal.config'],
     \ 'cabalproject': ['cabal.project', 'cabal.project.local'],
     \ 'calendar': ['calendar', '/.calendar/file', '/share/calendar/any/calendar.file', '/share/calendar/calendar.file', 'any/share/calendar/any/calendar.file', 'any/share/calendar/calendar.file'],
+    \ 'capnp': ['file.capnp'],
     \ 'catalog': ['catalog', 'sgml.catalogfile', 'sgml.catalog', 'sgml.catalog-file'],
     \ 'cdl': ['file.cdl'],
     \ 'cdrdaoconf': ['/etc/cdrdao.conf', '/etc/defaults/cdrdao', '/etc/default/cdrdao', '.cdrdao', 'any/etc/cdrdao.conf', 'any/etc/default/cdrdao', 'any/etc/defaults/cdrdao'],

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1229,
 /**/
     1228,
 /**/