Since libvirt-jenkins-ci commit 3c5ac0af41ba, MinGW packages
are installed on Fedora 30 rather than Fedora Rawhide, so we
need to update the Travis CI configuration accordingly.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NFabiano Fidêncio <fidencio@redhat.com>