rvo2: Include cstdint for uint32_t

Fixes #76907.

thirdparty/rvo2/rvo2_2d/Definitions.h

@@ -41,6 +41,7 @@
 #include <algorithm>
 #include <cmath>
 #include <cstddef>
+#include <cstdint>
 #include <limits>
 #include <vector>
 

thirdparty/rvo2/rvo2_3d/Agent3d.h

@@ -38,6 +38,7 @@
 #define RVO3D_AGENT_H_
 
 #include <cstddef>
+#include <cstdint>
 #include <utility>
 #include <vector>