patch 9.0.1281: Cadence files are not recognized

Problem:    Cadence files are not recognized.
Solution:   Recognize Cadence files. (Janez Podhostnik, closes #11951)
diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 629e697..b4a9564 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -1911,6 +1911,9 @@
 " SKILL
 au BufNewFile,BufRead *.il,*.ils,*.cdf		setf skill
 
+" Cadence
+au BufNewFile,BufRead *.cdc			setf cdc
+
 " SLRN
 au BufNewFile,BufRead .slrnrc			setf slrnrc
 au BufNewFile,BufRead *.score			setf slrnsc
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 1f9aae6..9cbc585 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -521,6 +521,7 @@
     \ 'sinda': ['file.sin', 'file.s85'],
     \ 'sisu': ['file.sst', 'file.ssm', 'file.ssi', 'file.-sst', 'file._sst', 'file.sst.meta', 'file.-sst.meta', 'file._sst.meta'],
     \ 'skill': ['file.il', 'file.ils', 'file.cdf'],
+    \ 'cdc': ['file.cdc'],
     \ 'slang': ['file.sl'],
     \ 'slice': ['file.ice'],
     \ 'slpconf': ['/etc/slp.conf', 'any/etc/slp.conf'],
diff --git a/src/version.c b/src/version.c
index cdca151..d185852 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1281,
+/**/
     1280,
 /**/
     1279,