patch 9.1.0507: hard to detect cursor movement in the command line

Problem:  hard to detect cursor movement in the command line
Solution: Add the CursorMovedC autocommand
          (Shougo Matsushita)

closes: #15040

Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/vim.h b/src/vim.h
index e703239..a80f844 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1361,6 +1361,7 @@
     EVENT_CURSORHOLD,		// cursor in same position for a while
     EVENT_CURSORHOLDI,		// idem, in Insert mode
     EVENT_CURSORMOVED,		// cursor was moved
+    EVENT_CURSORMOVEDC,		// cursor was moved in Command line mode
     EVENT_CURSORMOVEDI,		// cursor was moved in Insert mode
     EVENT_DIFFUPDATED,		// after diffs were updated
     EVENT_DIRCHANGED,		// after user changed directory