orbea 9c7affc2cf Travis + qb fixes. (#8040)
* travis: Enable building qt for linux.

* qb: Set QT_SELECT for moc and qtchooser.

This should have no effect on systems where qtchooser is not used.

Fixes https://github.com/libretro/RetroArch/issues/8028

* qb: Actually disable c++ features if there is no c++ compiler.

Now this warning actually does something.

  Warning: A working C++ compiler was not found, C++ features will be disabled.
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