msys-openssh: Upgrade to release 6.5p1

This comes without the HPN patches for two reasons:

- There are no HPN patches for release 6.5p1 at this time.

- The HPN patches make release 6.1p1 hang after the "Resolving deltas"
  step when cloning a Git repository over SSH.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>