hmm
http://packages.debian.org/wheezy/armel/freerdp-x11
and
https://github.com/FreeRDP/FreeRDP/ then.
since you have the patch already *look up*
this might be a worthwhile thing to at least TRY to add to buildroot?
There are threads on that process.
put on the "nice to have" pile, may try later.
small note: I do not have a single Windows 8 box to connect to (by choice)
so testing would be a problem.
EDIT: Hmm.. it's a cmake build thingy, Bleugh.
Not mega keen on doing this now myself then.
details here
https://github.com/FreeRDP/FreeRDP/wiki/Compilation
Remmina (remmina@sourceforge), implementing FreeRDP (FreeRDP), is able to connect to Windows 8/Windows Server 2012
hmm... will ruminate on that
http://packages.debian.org/wheezy/armel/remmina