Correct ARCHS build option
Correct ARCHS build option

Remove the ARCHS flags so that they are inherited from the main project (should result in 'arm6 arm7'). These were accidentally merged in from the merge with the ios5 branch

MIT-Mobile/MIT-Mobile-for-iOS,smartcop/MIT-Mobile-for-iOS,xNUTs/MIT-Mobile-for-iOS,xNUTs/MIT-Mobile-for-iOS,smartcop/MIT-Mobile-for-iOS,MIT-Mobile/MIT-Mobile-for-iOS