libfm-extra: new package

[Thomas:
  - adjust license: it's actually under GPLv2+, plus some bits under
    LGPLv2.1+ as noticed by Yann E. Morin, and add another license
    file for LGPLv2.1+
  - add missing dependency on host-intltool.]

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>