Add prototype for heap_getattr() to quiet compiler

src/include/access/heaptuple.h

+/*-------------------------------------------------------------------------
+ *
+ * heaptuple.h--
+ *    
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: heaptuple.h,v 1.1 1996/10/18 17:58:33 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	HEAPTUPLE_H
+#define HEAPTUPLE_H
+
+extern char *heap_getattr(HeapTuple tup,
+                          Buffer b,
+                          int attnum,
+                          TupleDesc tupleDesc,
+                          bool *isnull);
+
+#endif	/* HEAP_TUPLE_H */