patch 8.1.1254: mapping completion contains dead code

Problem:    Mapping completion contains dead code.
Solution:   Remove the code.
diff --git a/src/term.c b/src/term.c
index 08a5563..4a39fe3 100644
--- a/src/term.c
+++ b/src/term.c
@@ -6649,7 +6649,6 @@
     int		modifiers;
     int		cpo_bslash;
     int		cpo_special;
-    int		cpo_keycode;
 
     ga_init(&ga);
     ga.ga_itemsize = 1;
@@ -6657,7 +6656,6 @@
 
     cpo_bslash = (vim_strchr(p_cpo, CPO_BSLASH) != NULL);
     cpo_special = (vim_strchr(p_cpo, CPO_SPECI) != NULL);
-    cpo_keycode = (vim_strchr(p_cpo, CPO_KEYCODE) == NULL);
 
     for (; *str; ++str)
     {
@@ -6671,22 +6669,6 @@
 		modifiers = *++str;
 		c = *++str;
 	    }
-	    if (cpo_special && cpo_keycode && c == K_SPECIAL && !modifiers)
-	    {
-		int	i;
-
-		/* try to find special key in termcodes */
-		for (i = 0; i < tc_len; ++i)
-		    if (termcodes[i].name[0] == str[1]
-					    && termcodes[i].name[1] == str[2])
-			break;
-		if (i < tc_len)
-		{
-		    ga_concat(&ga, termcodes[i].code);
-		    str += 2;
-		    continue; /* for (str) */
-		}
-	    }
 	    if (c == K_SPECIAL && str[1] != NUL && str[2] != NUL)
 	    {
 		if (cpo_special)
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 30a2112..91a4b4e 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -107,9 +107,14 @@
 
   set cpo+=<
   map <Left> left
+  exe "set t_k6=\<Esc>[17~"
+  call feedkeys(":map \<Esc>[17~x f6x\<CR>", 'xt')
   call feedkeys(":map <L\<Tab>\<Home>\"\<CR>", 'xt')
   call assert_equal('"map <Left>', getreg(':'))
+  call feedkeys(":map \<Esc>[17~\<Tab>\<Home>\"\<CR>", 'xt')
+  call assert_equal("\"map <F6>x", getreg(':'))
   unmap <Left>
+  call feedkeys(":unmap \<Esc>[17~x\<CR>", 'xt')
   set cpo-=<
 
   set cpo+=B
diff --git a/src/version.c b/src/version.c
index c166346..0882fa2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1254,
+/**/
     1253,
 /**/
     1252,