WL#5030: Split and remove mysql_priv.h

This patch:

- Moves all definitions from the mysql_priv.h file into
  header files for the component where the variable is
  defined
- Creates header files if the component lacks one
- Eliminates all include directives from mysql_priv.h
- Eliminates all circular include cycles
- Rename time.cc to sql_time.cc
- Rename mysql_priv.h to sql_priv.h

sql/rpl_tblmap.h

@@ -52,6 +52,8 @@ void free_table_map_log_event(TABLE *table);
   A dedicated MEM_ROOT needs to be used, see below.
 */
 
+#include "hash.h"                               /* HASH */
+
 class table_mapping {
 
 private: