[res] Start using the native's header library

It adds a few useful classes, like SmallVector, to optimize
the most common use cases in Resources

Flag: EXEMPT build change
Test: builds
Change-Id: Ia386a86c4f5578abe3024226bda755687fede014
diff --git a/tools/aapt2/Android.bp b/tools/aapt2/Android.bp
index 4c81939..3f9016b 100644
--- a/tools/aapt2/Android.bp
+++ b/tools/aapt2/Android.bp
@@ -55,7 +55,10 @@
             cflags: ["-D_DARWIN_UNLIMITED_STREAMS"],
         },
     },
-    header_libs: ["jni_headers"],
+    header_libs: [
+        "jni_headers",
+        "native_headers",
+    ],
     static_libs: [
         "libandroidfw",
         "libutils",