meson: use dependency()+find_program() for wayland-scanner

Helps when the native wayland-scanner is located outside of PATH.
Inspired by the xserver code ;-)

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
1 file changed