Fix flatpak build
With https://github.com/storaged-project/libblockdev/pull/64 ported to the stable libblockdev branch it should be possible to build again with these changes.
Edited by Kai Lüke
With https://github.com/storaged-project/libblockdev/pull/64 ported to the stable libblockdev branch it should be possible to build again with these changes.