Fix Android-integrated build

Change-Id: I1eefd7ec6356df26de0a191691f7746debccbf02
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/32348
Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/src/Vulkan/libVulkan.cpp b/src/Vulkan/libVulkan.cpp
index cc32201..0c8d06d 100644
--- a/src/Vulkan/libVulkan.cpp
+++ b/src/Vulkan/libVulkan.cpp
@@ -49,6 +49,7 @@
 #ifdef __ANDROID__
 #include <vulkan/vk_android_native_buffer.h>
 #include "System/GrallocAndroid.hpp"
+#include <sync/sync.h>
 #endif
 
 #include "WSI/VkSwapchainKHR.hpp"