Fix innochecksum build failure.

storage/innobase/include/page0zip.h

@@ -545,6 +545,21 @@ from outside the buffer pool.
 # define UNIV_INLINE	UNIV_INLINE_ORIGINAL
 #endif
 
+#ifdef UNIV_INNOCHECKSUM
+/** Issue a warning when the checksum that is stored in the page is valid,
+but different than the global setting innodb_checksum_algorithm.
+@param[in]	current_algo	current checksum algorithm
+@param[in]	page_checksum	page valid checksum
+@param[in]	space_id	tablespace id
+@param[in]	page_no		page number */
+void
+page_warn_strict_checksum(
+	srv_checksum_algorithm_t	curr_algo,
+	srv_checksum_algorithm_t	page_checksum,
+	ulint				space_id,
+	ulint				page_no);
+#endif /* UNIV_INNOCHECKSUM */
+
 #ifndef UNIV_INNOCHECKSUM
 #ifndef UNIV_NONINL
 # include "page0zip.ic"