freerdp: get out of PNBLACKLIST, fix build, improve

We make the "freerdp" recipe active again, fix the build
by pulling a more recent version (the "stable" branches are
buggy and useless), and fix ARM runtime with -fPIC.

We can then :
- make X11 non-mandatory ;
- add support for Wayland ("wlfreerdp" client) ;
- add support for DirectFB ("dfreerdp" client) ;
- add support for GStreamer 1.0 ;
- make "heavy" features such as pulseaudio, cups...
non-mandatory.

We really want to install the "winpr-makecert" tool to have
TLS, but CMake does not position its RPATH cleanly, so let
us have a custom patch for that until it gets sorted out.

Signed-off-by: Manuel Bachmann <manuel.bachmann@iot.bzh>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>