Fix the tree: plugin-related changes, necessary for

CSV storage engine to be statically compiled.
Derived from antony's patch.


config/ac-macros/storage.m4:
  don't add objects to the object list if
  we don't have them
configure.in:
  compile CSV statically
sql/ha_myisam.cc:
  fix prototype to get rid of THD
sql/ha_myisam.h:
  fix prototype to get rid of THD
sql/handler.cc:
  new function for plugins
sql/handler.h:
  fix prototype to get rid of THD
  declare functions used by plugins
sql/item.h:
  Don't include all the types and files when not building mysqld
sql/lock.cc:
  don's assume that handler knows about THD
sql/mysql_priv.h:
  Don't include all the types and files when not building mysqld
  declare new plugin functions
sql/sql_class.cc:
  New plugin functions
sql/sql_class.h:
  Don't include all the types and files when not building mysqld
sql/sql_lex.h:
  Don't include all the types and files when not building mysqld
storage/csv/Makefile.am:
  compile CSV into a static lib to be
  linked into mysqld
storage/csv/ha_tina.cc:
  fix ha_tina to be able to build it static
storage/csv/ha_tina.h:
  fix prototype to get rid of THD

sql/sql_class.h

@@ -171,6 +171,7 @@ public:
 
 class delayed_insert;
 class select_result;
+class Time_zone;
 
 #define THD_SENTRY_MAGIC 0xfeedd1ff
 #define THD_SENTRY_GONE  0xdeadbeef
@@ -344,6 +345,8 @@ typedef struct system_status_var
 #define last_system_status_var com_stmt_close
 
 
+#ifdef MYSQL_SERVER
+
 void free_tmp_table(THD *thd, TABLE *entry);
 
 
@@ -354,7 +357,6 @@ void free_tmp_table(THD *thd, TABLE *entry);
 #define INIT_ARENA_DBUG_INFO
 #endif
 
-
 class Query_arena
 {
 public:
@@ -1905,3 +1907,5 @@ public:
 /* Functions in sql_class.cc */
 
 void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var);
+
+#endif /* MYSQL_SERVER */