PS-protocol data is stored in different format - the MYSQL_RECORDS->data
contains the link to the record content, not to array of the links to
the field's contents. So we have to handle it separately for
embedded-server query cache.


libmysqld/emb_qcache.cc:
  Bug #30430 crash:./mtr --embedded-server --ps-protocol cache_innodb func_misc...
  
  ps_protocol data now stored in it's particular way.
libmysqld/emb_qcache.h:
  Bug #30430 crash:./mtr --embedded-server --ps-protocol cache_innodb func_misc...
  
  Querycache_stream::load_char/store_char  ->
    load_uchar/store_uchar
mysql-test/r/func_misc.result:
  Bug #30430 crash:./mtr --embedded-server --ps-protocol cache_innodb func_misc...
  
  test result
mysql-test/t/func_misc.test:
  Bug #30430 crash:./mtr --embedded-server --ps-protocol cache_innodb func_misc...
  
  the test uses t2 table, so let's make sure it doesn't exist befor the start