SHOW commands fail in embedded mode because schema_table array doesn't
correspond to enum_schema_tables.

This patch implements a dummy implementation of the abstract fill_table
function to be used when the event scheduler (or other core feature)
isn't part of the build.


libmysqld/lib_sql.cc:
  Fixed type conversion warning.
sql/sql_show.cc:
  Leave entry for EVENTS to keep array consistent but set the 
  fill_table function pointer to a dummy function instead.