protocol/meson.build: search path for wayland-scanner before pkg-config for cross build

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
2 jobs for wayland-scanner-fallback in 1 minute and 9 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Container Prep
passed #250432
container_prep

00:00:28

 
  Build
passed #250433
build-native-meson

00:00:40