With Qt 5.7, they started to require c++11 support, and in 5.6.1 some
nullptr's showed up in QtAndroidExtras/qandroidfunctions.h, so now we
need to compile our c++ code with c++11 support in our compiler.
As Thiago pointed out, this effectively "downgrades" GCC 6 from c++14
support to c++11.
Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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