iOS: Link to the platform plugin and iosmain plugin and define main

Ideally we'd only have to do QTPLUGIN += ios, but this doesn't work as
we need to link with the force_load linker option. Even trying to build
on QTPLUGIN and then replace the -l line with what we need will fail, as
the prl logic in qmake which runs after all the prf files does not know
about the force_load option and will then fail to resolve dependencies
from the prl file.

Since we load the platform plugin using -force_load, there's no need to
generate a cpp file that does the plugin import.

The main wrapper is not a real Qt plugin, and doesn't have an import
function that we can call, so we link it manually instead of relying
on QTPLUGIN.

Change-Id: I0381a3c9ed7f8d41a4121e1fc0b7c0e210a8b832
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

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