Fix missing argument and function prototypes.

Not sure how I missed these in previous commit.

src/backend/access/gin/gininsert.c

@@ -143,7 +143,8 @@ buildFreshLeafTuple(GinState *ginstate,
 		/*
 		 * Initialize a new posting tree with the TIDs.
 		 */
-		postingRoot = createPostingTree(ginstate->index, items, nitem);
+		postingRoot = createPostingTree(ginstate->index, items, nitem,
+										buildStats);
 
 		/* And save the root link in the result tuple */
 		GinSetPostingTree(res, postingRoot);

src/include/access/gin_private.h

@@ -533,10 +533,9 @@ extern void ginEntryFillRoot(GinBtree btree, Buffer root, Buffer lbuf, Buffer rb
 extern IndexTuple ginPageGetLinkItup(Buffer buf);
 
 /* gindatapage.c */
-extern uint32 ginMergeItemPointers(ItemPointerData *dst,
-					 ItemPointerData *a, uint32 na,
-					 ItemPointerData *b, uint32 nb);
-
+extern BlockNumber createPostingTree(Relation index,
+				  ItemPointerData *items, uint32 nitems,
+				  GinStatsData *buildStats);
 extern void GinDataPageAddItemPointer(Page page, ItemPointer data, OffsetNumber offset);
 extern void GinDataPageAddPostingItem(Page page, PostingItem *data, OffsetNumber offset);
 extern void GinPageDeletePostingItem(Page page, OffsetNumber offset);
@@ -727,6 +726,12 @@ extern void ginHeapTupleFastCollect(GinState *ginstate,
 extern void ginInsertCleanup(GinState *ginstate,
 				 bool vac_delay, IndexBulkDeleteResult *stats);
 
+/* ginpostinglist.c */
+extern uint32 ginMergeItemPointers(ItemPointerData *dst,
+					 ItemPointerData *a, uint32 na,
+					 ItemPointerData *b, uint32 nb);
+
+
 /*
  * Merging the results of several gin scans compares item pointers a lot,
  * so we want this to be inlined. But if the compiler doesn't support that,