patch 9.1.0279: filetype: roc files are not recognized

Problem:  filetype: roc files are not recognized
Solution: Detect '*.roc' files as roc filetype,
          add a basic filetype plugin (nat-418)

closes: #14416

Signed-off-by: nat-418 <93013864+nat-418@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 3b94f96..19c8a2a 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -597,6 +597,7 @@
     rpgle: ['file.rpgle', 'file.rpgleinc'],
     robot: ['file.robot', 'file.resource'],
     robots: ['robots.txt'],
+    roc: ['file.roc'],
     ron: ['file.ron'],
     routeros: ['file.rsc'],
     rpcgen: ['file.x'],
diff --git a/src/version.c b/src/version.c
index 93f6634..6f49e11 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    279,
+/**/
     278,
 /**/
     277,