databases/firebird25-*: update to 2.5.9
- Fix core dump on newest versions of FreeBSD [1]
- Drop uneccesary patch files
ChangeLog at: https://firebirdsql.org/file/documentation/release_notes/html/en/2_5/rlsnotes25.html
PR: 254206 254849
Reported by: pi jbeich
Obtained from: https://lists.freebsd.org/pipermail/freebsd-ports/2021-March/120469.html [1]