GccToolChain: Update ABIs on Mac

Change-Id: Ic55389ee8200e3f78f8bb0752411b0a0ae5d5e62
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>
ios/iosplugin: cleanup imports and unused code

Change-Id: Ib8e446f71b1b8196f25dd0dc3838f15f27f54bd4
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>