patch 8.1.1801: cannot build without the +eval feature

Problem:    Cannot build without the +eval feature.
Solution:   Always define funcexe_T.

src/structs.h

@@ -1517,22 +1517,6 @@ struct funccall_S
 				// "func"
 };
 
-// Struct passed between functions dealing with function call execution.
-//
-// "argv_func", when not NULL, can be used to fill in arguments only when the
-// invoked function uses them.  It is called like this:
-//   new_argcount = argv_func(current_argcount, argv, called_func_argcount)
-//
-typedef struct {
-    int		(* argv_func)(int, typval_T *, int);
-    linenr_T	firstline;	// first line of range
-    linenr_T	lastline;	// last line of range
-    int		*doesrange;	// if not NULL: return: function handled range
-    int		evaluate;	// actually evaluate expressions
-    partial_T	*partial;	// for extra arguments
-    dict_T	*selfdict;	// Dictionary for "self"
-} funcexe_T;
-
 /*
  * Struct used by trans_function_name()
  */
@@ -1621,6 +1605,22 @@ typedef struct
 } scriptitem_T;
 #endif
 
+// Struct passed between functions dealing with function call execution.
+//
+// "argv_func", when not NULL, can be used to fill in arguments only when the
+// invoked function uses them.  It is called like this:
+//   new_argcount = argv_func(current_argcount, argv, called_func_argcount)
+//
+typedef struct {
+    int		(* argv_func)(int, typval_T *, int);
+    linenr_T	firstline;	// first line of range
+    linenr_T	lastline;	// last line of range
+    int		*doesrange;	// if not NULL: return: function handled range
+    int		evaluate;	// actually evaluate expressions
+    partial_T	*partial;	// for extra arguments
+    dict_T	*selfdict;	// Dictionary for "self"
+} funcexe_T;
+
 struct partial_S
 {
     int		pt_refcount;	// reference count

src/version.c

@@ -773,6 +773,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1801,
 /**/
     1800,
 /**/