Fix windows build of AAPT2

Change-Id: Ib8e1a4322510b582e9600a08d3118842c9abc73c
diff --git a/tools/aapt2/Linker.cpp b/tools/aapt2/Linker.cpp
index a863197..1cfb297 100644
--- a/tools/aapt2/Linker.cpp
+++ b/tools/aapt2/Linker.cpp
@@ -24,6 +24,7 @@
 
 #include <androidfw/AssetManager.h>
 #include <array>
+#include <bitset>
 #include <iostream>
 #include <map>
 #include <ostream>