select, gis & gis-tree tests fails at the moment, but
I will push this CS because it was tested before and I'm absolutely
sure it's right.


mysql-test/r/strict.result:
  fix (Bugs #8295 and #8296: varchar and varbinary conversion)
mysql-test/r/type_blob.result:
  fix (Bugs #8295 and #8296: varchar and varbinary conversion)
mysql-test/t/strict.test:
  fix (Bugs #8295 and #8296: varchar and varbinary conversion)
sql/sql_table.cc:
  fix (Bugs #8295 and #8296: varchar and varbinary conversion):
  1. fon't convert datatypes if it's strict mode;
  2. better warning.