iOS: Build libs (including Qt itself) for both simulator and device

Conceptually a Qt for iOS SDK or source build should support building
for both simulator and device, based on the same qmake binary and Qt
libraries. Qt Creator or Xcode should then be able to use the same Qt
version while still building for a single target at a time. This
applies to user libraries as well, which shouldn't require switching
to a different Qt when changing target platform from simulator to
device.

We achieve this by using Qt's exclusive_build feature, where we build
for the two targets in parallel, and then teach Xcode how to choose
the right library dynamically at build time.

Change-Id: I06d60e120d986085fb8686ced98f22f7047c4f23
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

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