win32: fix ssh://host:port when using Plink
Moves ssh argument building to platform specific utils code.
The win32 version looks for plink in ssh command string and
uses '-P' in lieu of '-p' for specifying a port
#!/bin/sh
hg
hg -q
hg help
hg -q help
hg add -h
hg add --skjdfks
hg help diff
hg help status
hg -q help status
hg help foo
hg skjdfks
exit 0