Fix harmless compiler warnings associated with SQLITE_ENABLE_HIDDEN_COLUMNS.

FossilOrigin-Name: 9c392c1019ee15f27c8e05b41246d2844f91f6c0
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 299fe86..e1fe6da 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -3348,7 +3348,11 @@
 Index *sqlite3PrimaryKeyIndex(Table*);
 i16 sqlite3ColumnOfIndex(Index*, i16);
 void sqlite3StartTable(Parse*,Token*,Token*,int,int,int,int);
-void sqlite3ColumnPropertiesFromName(Table*, Column*);
+#if SQLITE_ENABLE_HIDDEN_COLUMNS
+  void sqlite3ColumnPropertiesFromName(Table*, Column*);
+#else
+# define sqlite3ColumnPropertiesFromName(T,C) /* no-op */
+#endif
 void sqlite3AddColumn(Parse*,Token*);
 void sqlite3AddNotNull(Parse*, int);
 void sqlite3AddPrimaryKey(Parse*, ExprList*, int, int, int);