patch 8.2.4727: unused code

Problem:    Unused code.
Solution:   Remove code and add #ifdefs. (Dominique Pellé, closes #10136)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index fa3e8e9..6e7090a 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -181,7 +181,7 @@
 
 
 1.2 Function references ~
-				*Funcref* *E695* *E718* *E1086* *E1192*
+				*Funcref* *E695* *E718* *E1192*
 A Funcref variable is obtained with the |function()| function, the |funcref()|
 function or created with the lambda expression |expr-lambda|.  It can be used
 in an expression in the place of a function name, before the parenthesis