CMake: Fix automatic sysrootification detection for qmake

The way we detected whether SysrootifyPrefix needs to be set was
incorrect.

We checked if extprefix == prefix => SysrootifyPrefix should be
true. But that was previously always the case for a non-prefix build,
which means it was not possible to build apps (due to qmake expecting
to find include dirs in the sysroot, despite the non-prefix Qt not
being installed anywhere into the sysroot).

Instead we should do what qmake does. Only set SysrootifyPrefix to
true if extprefix was not provided and a sysroot is available.

To make it work for iOS and Android, the sysroot detection code had to
be moved earlier than the SysrootifyPrefix detection.

Task-number: QTBUG-86053
Change-Id: Idcc1260a675fb2ef9ae27fc9dc42a68b30f763b8
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

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