patch 9.1.0010: Keymap completion is not available

Problem:  Keymap completion is not available
Solution: Add keymap completion (Doug Kearns)

Add keymap completion to the 'keymap' option, user commands and builtin
completion functions.

closes: #13692

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/usercmd.c b/src/usercmd.c
index 04b3419..e2c0114 100644
--- a/src/usercmd.c
+++ b/src/usercmd.c
@@ -73,6 +73,9 @@
     {EXPAND_HELP, "help"},
     {EXPAND_HIGHLIGHT, "highlight"},
     {EXPAND_HISTORY, "history"},
+#if defined(FEAT_KEYMAP)
+    {EXPAND_KEYMAP, "keymap"},
+#endif
 #if defined(HAVE_LOCALE_H) || defined(X_LOCALE)
     {EXPAND_LOCALES, "locale"},
 #endif