OS X - QCollator::compare() returns wrong results.

kUCCollateDigitsAsNumberMask works only if kUCCollateDigitsOverrideMask
is also set.
Update 0: - test added.
Task-number: QTBUG-40777
Change-Id: I48bfec78f5f8439a51f8d749f0fc4397a72b29f2
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Properly null-terminate ifreq::irf_name

It's unclear whether it has to be, but there are a lot of patches floating around
on the net that indicate that Coverty requires this, and the SIOCGIFADDR micro-howto
also NUL-terminates the string.

So who is Qt to differ?

Change-Id: I1aa5a2de47a58b1d9b73556d5a6ddc48b2c40ce3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>