Bug#1017802: gr-funcube FTBFS witn fmtlib 9.0.0 (?)

[Shengjing Zhu]

Control: forwarded -1 https://github.com/dl1ksv/gr-funcube/pull/8
Control: tags -1 + patch

Please see the patch

https://github.com/dl1ksv/gr-funcube/pull/8