Remove unused bad refs that break release build
Remove unused bad refs that break release build

The unused references to DeltaCompression* were incorrect (referenced
net45 that does not exist). That prevented DeltaCompression* from
being CopyLocal from Squirrel.csproj. That caused ILRepack to fail
because DeltaCompression* is needed by Squirrel.dll. Since Update.csproj
doesn't need the references, remove them and everything works.

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