weston: Add rdp PACKAGECONFIG

Weston has RDP backend support. This can be used e.g. for screen mirroring.
Add PACKAGECONFIG so it can be enabled by the user. By default, this is not
enabled, to retain the old behavior of the recipe.

Below is an example testcase of using the RDP backend for screen mirroring,
i.e. two devices display the same content across ethernet link, input on
either is passed across the link.

- Add the following to weston.ini:
  [core]
  modules=screen-share.so
  screen-share=true
  [screen-share]
  command=/usr/bin/weston --backend=rdp-backend.so --shell=fullscreen-shell.so --no-clients-resize --rdp-tls-cert=/path/to/board.crt --rdp-tls-key=/path/to/board.key --no-config

- Generate keys on the board (the board.key and board.crt above):
  $ winpr-makecert -rdp -path /path/to/

- Restart weston on the board. To start screen sharing, press
  Ctrl-Alt-S
  on the keyboard (see weston compositor/screen-share.c).

- Connect to the weston using freerdp, e.g.:
  $ xfreerdp /v:192.168.1.300

(From OE-Core rev: 05706a487c2e57fb26935276a2ec650405900243)

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Joshua Watt <JPEWhacker@gmail.com>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/wayland/weston_9.0.0.bb

@@ -33,7 +33,7 @@ LDFLAGS += "${@bb.utils.contains('DISTRO_FEATURES', 'lto', '-Wl,-z,undefs', '',
 
 WESTON_MAJOR_VERSION = "${@'.'.join(d.getVar('PV').split('.')[0:1])}"
 
-EXTRA_OEMESON += "-Dbackend-default=auto -Dbackend-rdp=false -Dpipewire=false"
+EXTRA_OEMESON += "-Dbackend-default=auto -Dpipewire=false"
 
 PACKAGECONFIG ??= "${@bb.utils.contains('DISTRO_FEATURES', 'wayland', 'kms fbdev wayland egl clients', '', d)} \
                    ${@bb.utils.contains('DISTRO_FEATURES', 'x11 wayland', 'xwayland', '', d)} \
@@ -59,6 +59,8 @@ PACKAGECONFIG[x11] = "-Dbackend-x11=true,-Dbackend-x11=false,virtual/libx11 libx
 PACKAGECONFIG[headless] = "-Dbackend-headless=true,-Dbackend-headless=false"
 # Weston on framebuffer
 PACKAGECONFIG[fbdev] = "-Dbackend-fbdev=true,-Dbackend-fbdev=false,udev mtdev"
+# Weston on RDP
+PACKAGECONFIG[rdp] = "-Dbackend-rdp=true,-Dbackend-rdp=false,freerdp"
 # weston-launch
 PACKAGECONFIG[launch] = "-Dweston-launch=true,-Dweston-launch=false,drm"
 # VA-API desktop recorder