Fix comments that were made obsolete by the removal of the column cache.

FossilOrigin-Name: 2041231d56c7b02b785015ef4d1af260d61326eab1b2a304c17faa3e33f76441
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 1348d46..6304680 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -1558,7 +1558,7 @@
 ** selectively disable various optimizations.
 */
 #define SQLITE_QueryFlattener 0x0001   /* Query flattening */
-#define SQLITE_ColumnCache    0x0002   /* Column cache */
+                          /*  0x0002   available for reuse */
 #define SQLITE_GroupByOrder   0x0004   /* GROUPBY cover of ORDERBY */
 #define SQLITE_FactorOutConst 0x0008   /* Constant factoring */
 #define SQLITE_DistinctOpt    0x0010   /* DISTINCT using indexes */
@@ -2958,13 +2958,6 @@
 };
 
 /*
-** Size of the column cache
-*/
-#ifndef SQLITE_N_COLCACHE
-# define SQLITE_N_COLCACHE 10
-#endif
-
-/*
 ** At least one instance of the following structure is created for each
 ** trigger that may be fired while parsing an INSERT, UPDATE or DELETE
 ** statement. All such objects are stored in the linked list headed at