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/table.cc

@@ -16,8 +16,20 @@
 
 /* Some general useful functions */
 
-#include "mysql_priv.h"
+#include "sql_priv.h"
+#include "unireg.h"                    // REQUIRED: for other includes
+#include "table.h"
+#include "frm_crypt.h"           // get_crypt_for_frm
+#include "key.h"                                // find_ref_key
+#include "sql_table.h"                          // build_table_filename,
+                                                // primary_key_name
 #include "sql_trigger.h"
+#include "sql_parse.h"                          // free_items
+#include "strfunc.h"                            // unhex_type2
+#include "sql_partition.h"       // mysql_unpack_partition,
+                                 // fix_partition_func, partition_info
+#include "sql_acl.h"             // *_ACL, acl_getroot_no_password
+#include "sql_base.h"            // release_table_share
 #include <m_ctype.h>
 #include "my_md5.h"