patch 9.0.0002: map functionality outside of map.c

Problem:    Map functionality outside of map.c.
Solution:   Move f_hasmapto() to map.c.  Rename a function. (closes #10611)

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2,
 /**/
     1,
 /**/