branches/zip: trx_undo_rec_copy(): Add const qualifier to undo_rec.

This is a non-functional change.

include/trx0rec.h

@@ -44,7 +44,7 @@ UNIV_INLINE
 trx_undo_rec_t*
 trx_undo_rec_copy(
 /*==============*/
-	trx_undo_rec_t*	undo_rec,	/*!< in: undo log record */
+	const trx_undo_rec_t*	undo_rec,	/*!< in: undo log record */
 	mem_heap_t*		heap);		/*!< in: heap where copied */
 /**********************************************************************//**
 Reads the undo log record type.

include/trx0rec.ic

@@ -100,7 +100,7 @@ UNIV_INLINE
 trx_undo_rec_t*
 trx_undo_rec_copy(
 /*==============*/
-	trx_undo_rec_t*	undo_rec,	/*!< in: undo log record */
+	const trx_undo_rec_t*	undo_rec,	/*!< in: undo log record */
 	mem_heap_t*		heap)		/*!< in: heap where copied */
 {
 	ulint		len;

trx/trx0rec.c

@@ -1333,7 +1333,7 @@ trx_undo_get_undo_rec_low(
 	ulint		rseg_id;
 	ulint		page_no;
 	ulint		offset;
-	page_t*		undo_page;
+	const page_t*	undo_page;
 	trx_rseg_t*	rseg;
 	ibool		is_insert;
 	mtr_t		mtr;