patch 8.2.4186: cannot use an import in 'patchexpr'

Problem:    Cannot use an import in 'patchexpr'.
Solution:   Set the script context when evaluating 'patchexpr'.  Do not
            require 'patchexpr' to return a bool, it was ignored anyway.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4186,
 /**/
     4185,
 /**/