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.h b/libweston/compositor.h
index ad2f6e3..0133084 100644
--- a/libweston/compositor.h
+++ b/libweston/compositor.h
@@ -32,6 +32,7 @@
 #endif
 
 #include <stdbool.h>
+#include <stdint.h>
 #include <time.h>
 #include <pixman.h>
 #include <xkbcommon/xkbcommon.h>