include stdint.h for int32_t/uint32_t

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Reviewed-by: Yong Bakos <ybakos@humanoriented.com>
diff --git a/libweston/compositor-wayland.h b/libweston/compositor-wayland.h
index de69b98..b705dee 100644
--- a/libweston/compositor-wayland.h
+++ b/libweston/compositor-wayland.h
@@ -32,6 +32,8 @@
 extern "C" {
 #endif
 
+#include <stdint.h>
+
 #define WESTON_WAYLAND_BACKEND_CONFIG_VERSION 1
 
 struct weston_wayland_backend_output_config {