FreeRDP/FreeRDP — pull request #589 by bmiklautz (2012-05-14 13:48:00+00:00)
Title: Only sent frame acknowledge if the server supports it

If the servers doesn't announce CAPSET_TYPE_FRAME_ACKNOWLEDGE
frame acknowledgements should not be sent even if enabled on the command line (e.g. with --frame-ack 2).

Otherwise we get an
ERRINFO_UNKNOWN_DATA_PDU_TYPE (0x000010C9):
Unknown pduType2 field in a received Share Data Header (section 2.2.8.1.1.1.2).