rdp: allow to compile against FreeRDP 2.0

FreeRDP 2.0 is about to be released, this allows to compile against this version.
The detection is adjusted to prefer FreeRDP 2 against version 1.x.

Signed-off-by: David Fort <contact@hardening-consulting.com>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
2 files changed