Add Q_OS_APPLE define on Apple operating systems

It's quite common that macOS and iOS share backends, for example due to
the functionality being part of one of the Apple core frameworks. In
this case the support isn't directly tied to the Darwin kernel per se,
so let's use a more general define to refer to the union of Apple
based features.

Pick-to: 6.6
Change-Id: I71cac5ec1d74cd86eba67a64b20846e48c9f05c5
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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