Update to work with scanner that doesn't hardcode wl_*

This lets us drop the wl_ prefix for the un-officual screenshooter protocol.
diff --git a/clients/screenshot.c b/clients/screenshot.c
index 3582cc4..8f76a09 100644
--- a/clients/screenshot.c
+++ b/clients/screenshot.c
@@ -39,10 +39,10 @@
 handle_global(struct wl_display *display, uint32_t id,
 	      const char *interface, uint32_t version, void *data)
 {
-	struct wl_screenshooter **screenshooter = data;
+	struct screenshooter **screenshooter = data;
 
 	if (strcmp(interface, "screenshooter") == 0)
-		*screenshooter = wl_screenshooter_create(display, id, 1);
+		*screenshooter = screenshooter_create(display, id, 1);
 }
 
 int main(int argc, char *argv[])
@@ -50,7 +50,7 @@
 	struct wl_display *display;
 	GMainLoop *loop;
 	GSource *source;
-	struct wl_screenshooter *screenshooter;
+	struct screenshooter *screenshooter;
 
 	display = wl_display_connect(NULL);
 	if (display == NULL) {
@@ -70,7 +70,7 @@
 	source = wl_glib_source_new(display);
 	g_source_attach(source, NULL);
 
-	wl_screenshooter_shoot(screenshooter);
+	screenshooter_shoot(screenshooter);
 
 	g_idle_add((GSourceFunc) g_main_loop_quit, loop);
 	g_main_loop_run(loop);
diff --git a/compositor/screenshooter.c b/compositor/screenshooter.c
index 53ed931..78d0be3 100644
--- a/compositor/screenshooter.c
+++ b/compositor/screenshooter.c
@@ -23,13 +23,13 @@
 #include "compositor.h"
 #include "screenshooter-server-protocol.h"
 
-struct wl_screenshooter {
+struct screenshooter {
 	struct wl_object base;
 	struct wlsc_compositor *ec;
 };
 
 static void
-screenshooter_shoot(struct wl_client *client, struct wl_screenshooter *shooter)
+screenshooter_shoot(struct wl_client *client, struct screenshooter *shooter)
 {
 	struct wlsc_compositor *ec = shooter->ec;
 	struct wlsc_output *output;
@@ -65,20 +65,20 @@
 	}
 }
 
-struct wl_screenshooter_interface screenshooter_implementation = {
+struct screenshooter_interface screenshooter_implementation = {
 	screenshooter_shoot
 };
 
 void
 screenshooter_create(struct wlsc_compositor *ec)
 {
-	struct wl_screenshooter *shooter;
+	struct screenshooter *shooter;
 
 	shooter = malloc(sizeof *shooter);
 	if (shooter == NULL)
 		return;
 
-	shooter->base.interface = &wl_screenshooter_interface;
+	shooter->base.interface = &screenshooter_interface;
 	shooter->base.implementation =
 		(void(**)(void)) &screenshooter_implementation;
 	shooter->ec = ec;