Firebird Perl extension DBD-Firebird version 1.24 is released

Perl extension DBD::Firebird version 1.24 is released with a few Firebird3/Debian related changes :
* Fix 81-event-fork.t to not fail when FirebirdEmbedded is not available
* Avoid compiler warning about implicit declaration of dbd_st_finish_internal
* Add support for building/testing with Firebird 3
* Fix a couple of typos, thanks to Nick Morrott of Debian Perl Group
* Explicitly undef the statement handle in dbi-primary-key-info.t, avoiding an error during global destruction