Added missing checking of no_keyread


Docs/manual.texi:
  Fixed wrong example
myisam/myisamchk.c:
  Removed not needed include file
mysys/my_pthread.c:
  Fix for HPUX
mysys/my_thr_init.c:
  Removed not needed warning
scripts/mysql_fix_privilege_tables.sh:
  Cleanup
sql/sql_lex.cc:
  Removed not needed initialization
sql/sql_parse.cc:
  Cleanup of checking of user resources
sql/sql_select.cc:
  Added checking of no_keyread