Fix windows build command.

[uddhav-dave]

Building on windows requires adding feature flag to openpgp-dsm dependency in Cargo.toml of sq crate:

openpgp-dsm = { path = "../openpgp-dsm", default-features = false, features=["crypto-cng"]}

Without the above step the build process uses crypto-net as a dependency.

This step can be avoided by adding some platform specific dependency flags so that windows binary can be build using
cargo build --release --no-default-features --features=net,crypto-cng,compression out of the box.