Fix 5.9 toolchain requirement for Xcode builds #55
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Package manifests are always built with the default Xcode toolchain, meaning that even if a 5.9 toolchain is selected the
swift-tools-version: 5.9will not be satisfied without an Xcode installation that comes packaged with a 5.9 toolchain. Instead, lets add a#errorto FoundationEssentials for older compilers and restore the 5.8 requirement in the package manifest to allow us to build this in Xcode.