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-x11.c b/libweston/compositor-x11.c
index e2e6110..9e2dc37 100644
--- a/libweston/compositor-x11.c
+++ b/libweston/compositor-x11.c
@@ -29,6 +29,7 @@
 
 #include <assert.h>
 #include <stddef.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>