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/sql_repl.h

@@ -65,6 +65,7 @@ typedef struct st_load_file_info
 
 int log_loaded_block(IO_CACHE* file);
 int init_replication_sys_vars();
+void mysql_binlog_send(THD* thd, char* log_ident, my_off_t pos, ushort flags);
 
 #endif /* HAVE_REPLICATION */