Ruby 3.3.0 no longer bundles the readline module[1] so readline is no
longer a build dependency[2].
Ruby 3.2.0 no longer bundles the gdbm module[3] so gdbm is no longer a
build dependency.
[1] 59fd67fc3d
[2] 172077232e
(From OE-Core rev: b616e260855a9d8fbf5c1b6a1b49278673b24d7f)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>