net-im/swift: disable experimental option

net-im/swift: disable experimental option

For some users, net-im/swift crashes directly, when experimental is
active. According to upstream, this should be anyway disabled.
But experimental_ft stays enabled, since according to upstream, it is
considered stable, they have only forgotten to remove experimental from
it's name. Besides, it's needed for net-im/spectrum2.

Many thanks for testing goes to Martin Samek <mr@vmsc.eu>

Closes: https://bugs.gentoo.org/671826
Package-Manager: Portage-2.3.52, Repoman-2.3.12
Signed-off-by: Conrad Kostecki <conrad@kostecki.com>
Signed-off-by: Andrey Utkin <andrey_utkin@gentoo.org>