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_record_old.h

@@ -16,6 +16,8 @@
 #ifndef RPL_RECORD_OLD_H
 #define RPL_RECORD_OLD_H
 
+#include "log_event.h"                          /* Log_event_type */
+
 #ifndef MYSQL_CLIENT
 size_t pack_row_old(TABLE *table, MY_BITMAP const* cols,
                     uchar *row_data, const uchar *record);