branches/5.1:

Preparation for the fix of
Bug#45097 Hang during recovery, redo logs for doublewrite buffer pages

Do not include unnecessary headers mtr0log.h and fut0lst.h in trx0sys.h
and include fsp0fsp.h just before it is needed. This is needed in order
to be able to use TRX_SYS_SPACE in mtr0log.ic.

include/trx0sys.h

@@ -13,15 +13,12 @@ Created 3/26/1996 Heikki Tuuri
 
 #include "trx0types.h"
 #include "mtr0mtr.h"
-#include "mtr0log.h"
 #include "ut0byte.h"
 #include "mem0mem.h"
 #include "sync0sync.h"
 #include "ut0lst.h"
 #include "buf0buf.h"
 #include "fil0fil.h"
-#include "fut0lst.h"
-#include "fsp0fsp.h"
 #include "read0types.h"
 
 /* In a MySQL replication slave, in crash recovery we store the master log
@@ -302,6 +299,7 @@ trx_sys_print_mysql_master_log_pos(void);
 
 /* Space id and page no where the trx system file copy resides */
 #define	TRX_SYS_SPACE	0	/* the SYSTEM tablespace */
+#include "fsp0fsp.h"
 #define	TRX_SYS_PAGE_NO	FSP_TRX_SYS_PAGE_NO
 
 /* The offset of the transaction system header on the page */