pycosh: fix psput/psget on Windows
pycosh: fix psput/psget on Windows

Transferring binary files failed due to reading files in
text mode on Windows host.

mixu-/fMBT,01org/fMBT,mixu-/fMBT,mixu-/fMBT,mixu-/fMBT,mixu-/fMBT,01org/fMBT,01org/fMBT,01org/fMBT,01org/fMBT