Add include for linux and windows.

include/rive/renderer.hpp

diff --git a/include/rive/renderer.hpp b/include/rive/renderer.hpp
index f48d5ec..de385b8 100644
--- a/include/rive/renderer.hpp
+++ b/include/rive/renderer.hpp
@@ -10,6 +10,7 @@
 #include "rive/shapes/paint/stroke_join.hpp"
 #include <cmath>
 #include <stdio.h>
+#include <cstdint>
 
 namespace rive
 {