Fix Windows build
Fix Windows build

OsEnvironment property needs to be set before it is used in NuGet.props

chipitsine/msbuild,sean-gilliam/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,mono/msbuild,rainersigwald/msbuild,mono/msbuild,Microsoft/msbuild,jeffkl/msbuild,rainersigwald/msbuild,jeffkl/msbuild,mono/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,chipitsine/msbuild,Microsoft/msbuild,chipitsine/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,cdmihai/msbuild,AndyGerlicher/msbuild,jeffkl/msbuild,jeffkl/msbuild,Microsoft/msbuild,rainersigwald/msbuild,chipitsine/msbuild,Microsoft/msbuild,sean-gilliam/msbuild,mono/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild