Remove MMCacheLock -- it is no longer used. Per ITAGAKI Takahiro.

Author: Neil Conway

src/include/storage/lwlock.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/storage/lwlock.h,v 1.20 2005/06/17 22:32:50 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/storage/lwlock.h,v 1.21 2005/07/27 08:05:36 neilc Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -33,7 +33,6 @@ typedef enum LWLockId
 	ProcArrayLock,
 	SInvalLock,
 	FreeSpaceLock,
-	MMCacheLock,
 	WALInsertLock,
 	WALWriteLock,
 	ControlFileLock,