gitian: Make windows dependencies outputs fully deterministic

Sort .zip order, and other determinism changes to make sure builds
are repeatable for windows deps.
gitian: Post-process .a libraries for win to be deterministic
gitian: sort generated source distribution archive for windows

Make the bitcoin-X.X.X.tar.gz deterministic.
Merge pull request #3625

4ce9106 gitian: sort generated source distribution archive for windows (Wladimir J. van der Laan)
6b55e6b gitian: Post-process .a libraries for win to be deterministic (Wladimir J. van der Laan)
c43d1e5 gitian: Make windows dependencies outputs fully deterministic (Wladimir J. van der Laan)