minimizer: Keep some libraries for qemu-kvm

qemu-kvm and friends rely on some libraries which were previously
blacklisted:
- boost
- libicu
- pango

Change-Id: I4bc5b720e99b24109c4bab432967bbe4a8fcd67e
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>