libweston: add missing include

Fixes missing prototypes compilation warnings emitted when a function
is defined before its prototype is declared.

These warnings were introduced over time since the switch to meson
because the -Wmissing-protoypes was not included in the compilation
arguments.

Signed-off-by: Guillaume Champagne <champagne.guillaume.c@gmail.com>

libweston/animation.c

@@ -36,6 +36,7 @@
 #include <fcntl.h>
 
 #include <libweston/libweston.h>
+#include "libweston-internal.h"
 #include "shared/helpers.h"
 #include "shared/timespec-util.h"
 

libweston/bindings.c

@@ -30,6 +30,7 @@
 #include <linux/input.h>
 
 #include <libweston/libweston.h>
+#include "libweston-internal.h"
 #include "shared/helpers.h"
 #include "shared/timespec-util.h"
 

libweston/clipboard.c

@@ -34,6 +34,7 @@
 #include <sys/uio.h>
 
 #include <libweston/libweston.h>
+#include "libweston-internal.h"
 #include "shared/helpers.h"
 
 struct clipboard_source {

libweston/content-protection.c

@@ -32,6 +32,7 @@
 #include <string.h>
 #include <libweston/libweston.h>
 #include <libweston/weston-log.h>
+#include "libweston-internal.h"
 #include "weston-content-protection-server-protocol.h"
 #include "shared/helpers.h"
 #include "shared/timespec-util.h"

libweston/data-device.c

@@ -33,6 +33,7 @@
 #include <assert.h>
 
 #include <libweston/libweston.h>
+#include "libweston-internal.h"
 #include "shared/helpers.h"
 #include "shared/timespec-util.h"
 

libweston/log.c

@@ -35,6 +35,7 @@
 #include <wayland-util.h>
 
 #include <libweston/libweston.h>
+#include "weston-log-internal.h"
 
 /**
  * \defgroup wlog weston-logging

libweston/noop-renderer.c

@@ -29,6 +29,7 @@
 #include <stdlib.h>
 
 #include <libweston/libweston.h>
+#include "libweston-internal.h"
 
 static int
 noop_renderer_read_pixels(struct weston_output *output,

libweston/touch-calibration.c

@@ -35,6 +35,7 @@
 #include "shared/timespec-util.h"
 #include <libweston/libweston.h>
 #include "libweston-internal.h"
+#include "backend.h"
 
 #include "weston-touch-calibration-server-protocol.h"
 

xwayland/selection.c

@@ -32,6 +32,7 @@
 #include <fcntl.h>
 #include <errno.h>
 
+#include <libweston/libweston.h>
 #include "xwayland.h"
 #include "shared/helpers.h"