gitian: Make windows dependencies outputs fully deterministic

Sort .zip order, and other small determinism changes to make sure builds are repeatable for windows deps.

Boost windows:

    b107d583d6982be3d5bbba23c050495551d2ca7a219289cfcb716bf18c9a64ec  boost-win32-1.55.0-gitian-r6.zip
    f0c4b7d6ea3ed991e7a749cfe764baf96432af8a789a9e1647d49f896513d17d  boost-win64-1.55.0-gitian-r6.zip

Deps windows:

    a23d38cb0648de0a1180fbbdf4378fc18d9c6589e126603378a9e9f12bd0f5d5  bitcoin-deps-win32-gitian-r10.zip
    c49f15d7e529c91d88d78acccb800bb49bccde50d15540cfc79406e0d74c1f47  bitcoin-deps-win64-gitian-r10.zip

Protobuf windows:

    44bbd96f02489c1ace9d483c1a490e739cc89a9933ce69f643825adc10d1bd59  protobuf-win32-2.5.0-gitian-r4.zip
    1e0dfb4a0784aef98d1980c92913dd23d8b9a25b9e20db34eeb0aed5e591b734  protobuf-win64-2.5.0-gitian-r4.zip

Qt windows:

    16b997483f465378bb6a6883aa81bf67d0eea17269b066df973083c9fc8b0b19  qt-win32-5.2.0-gitian-r2.zip
    0c9b1657942d98f555a6840c7367469f91d368cdc857a33d9720f65dc574f44f  qt-win64-5.2.0-gitian-r2.zip