Maria, very minor changes.

mysys/Makefile.am:
  test_pagecache* programs need to link with dbug
  (I used BUILD/compile-pentium64-valgrind-max)
mysys/mf_pagecache.c:
  unused constant

mysys/Makefile.am

@@ -20,7 +20,8 @@ MYSQLBASEdir=		$(prefix)
 INCLUDES =		@ZLIB_INCLUDES@ -I$(top_builddir)/include \
 			-I$(top_srcdir)/include -I$(srcdir)
 pkglib_LIBRARIES =	libmysys.a
-LDADD =			libmysys.a $(top_builddir)/strings/libmystrings.a
+LDADD =			libmysys.a $(top_builddir)/strings/libmystrings.a \
+			$(top_builddir)/dbug/libdbug.a
 noinst_HEADERS =	mysys_priv.h my_static.h
 libmysys_a_SOURCES =    my_init.c my_getwd.c mf_getdate.c my_mmap.c \
 			mf_path.c mf_loadpath.c my_file.c \

mysys/mf_pagecache.c

@@ -154,7 +154,6 @@ struct st_pagecache_hash_link
 #define BLOCK_IN_FLUSH   16 /* block is in flush operation                 */
 #define BLOCK_CHANGED    32 /* block buffer contains a dirty page          */
 #define BLOCK_WRLOCK     64 /* write locked block                          */
-#define BLOCK_CPYWRT    128 /* block buffer is in copy&write (see also cpyrd) */
 
 /* page status, returned by find_key_block */
 #define PAGE_READ               0