Add missing libc++ includes

Bug: 175635923
Test: m MODULES-IN-frameworks-av-media-ndk
Change-Id: Ie982aa19f416cac2f0a08bf460b03dcbaad78035
diff --git a/media/ndk/fuzzer/ndk_crypto_fuzzer.cpp b/media/ndk/fuzzer/ndk_crypto_fuzzer.cpp
index 2b22f0f..bff5a6b 100644
--- a/media/ndk/fuzzer/ndk_crypto_fuzzer.cpp
+++ b/media/ndk/fuzzer/ndk_crypto_fuzzer.cpp
@@ -17,6 +17,8 @@
 #include <fuzzer/FuzzedDataProvider.h>
 #include <media/NdkMediaCrypto.h>
 
+#include <functional>
+
 constexpr size_t kMaxString = 256;
 constexpr size_t kMinBytes = 0;
 constexpr size_t kMaxBytes = 1000;