patch 8.1.0477: tiny build fails

Problem:    Tiny build fails.
Solution:   Add a dummy declaration for funccal_entry_T.

src/structs.h

@@ -1445,6 +1445,10 @@ typedef struct
 {
     int	    dummy;
 } funcdict_T;
+typedef struct
+{
+    int	    dummy;
+} funccal_entry_T;
 #endif
 
 struct partial_S

src/version.c

@@ -792,6 +792,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    477,
 /**/
     476,
 /**/