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.h

@@ -17,6 +17,11 @@
 #define RPL_RECORD_H
 
 #include <rpl_reporting.h>
+#include "my_global.h"                          /* uchar */
+
+class Relay_log_info;
+struct TABLE;
+typedef struct st_bitmap MY_BITMAP;
 
 #if !defined(MYSQL_CLIENT)
 size_t pack_row(TABLE* table, MY_BITMAP const* cols,