msys-openssh: Remove not-working HPN patches

Some more testing revealed that the HPN patches make openssh unusable.
For example after calls like
```sh
scp server:~/existingFile .
```
the ssh and scp processes hang indefinitely.

The server is running OpenSSH_5.5p1 Debian-6+squeeze3, OpenSSL 0.9.8o 01 Jun 2010.

Upgrading to 6.2p2 did not help either.