libffi6 from home:fstrba project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:fstrba/openSUSE_Tumbleweed/home:fstrba.repo
zypper refresh
zypper install libffi6

For openSUSE Factory run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:fstrba/openSUSE_Factory/home:fstrba.repo
zypper refresh
zypper install libffi6

For openSUSE Leap 15.6 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:fstrba/openSUSE_Leap_15.6/home:fstrba.repo
zypper refresh
zypper install libffi6