Fix warnings for Xcode 12, when used from SPM #102
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SPM in Xcode 12 bumps minimum iOS deployment target to iOS 9, which produces warnings when trying to use Dwifft.
This PR fixes that by deleting minimum supported platforms from Package.swift. Please note, that macOS platform stays, because Dwifft minimum requirement for MacOS is higher than SwiftPM minimum deployment target.
I've also fixed couple new warnings from Swift compiler and enabled building for watchOS.