buildroot

qt5base: conditionally install bundled fonts to target

qtbase carries nor more fonts since c5ceabb9a1caf6b9b7615a28c3097f221772f645

So for Qt Version 5.8.0 this reverts commit
cdfa21b06041eb601e0bea79f2c8f50e9d637384 and part of
186ef9f6f4647ed34b67a3427a5e0e249f0794e7.

Signed-off-by: Andreas Naumann <anaumann@ultratronik.de>
Signed-off-by: Julien Corjon <corjon.j@ecagroup.com>
Signed-off-by: Zoltan Gyarmati <mr.zoltan.gyarmati@gmail.com>
[Thomas: adjust commit log.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>