Adding x11 feature to poky-emulators distro

Signed-off-by: Sergio Prado <sergio.prado@e-labworks.com>
Fixing error when trying to build outside of source dir.
Fixing missing dependencies.

Signed-off-by: Sergio Prado <sergio.prado@e-labworks.com>
Fixing error when trying to build outside of source dir.
Using pkg-config instead of sdl-config.

Signed-off-by: Sergio Prado <sergio.prado@e-labworks.com>