- allow CREATE VIEW as well as DROP VIEW to use in prepared statements;
  - fix CREATE VIEW implementation to make it work in prepared statements.


mysql-test/r/sp.result:
  Results file for the test case for BUG#13095.
mysql-test/t/sp.test:
  Test case for BUG#13095.
sql/sql_lex.h:
  Added a variable to remember start of whole CREATE VIEW statement
  as well as start of its SELECT part.
sql/sql_prepare.cc:
  Allow CREATE VIEW and DROP VIEW to use in prepared statements.
sql/sql_view.cc:
  Use stored start of whole CREATE VIEW statement instead of thd->query,
  which differs from the original when prepared statement is executing.
sql/sql_yacc.yy:
  Remember start of whole CREATE VIEW statement as well as start of its
  SELECT part.