libbinder_ndk: way to convert AParcel to libbinder

Bye-bye relative includes. Hello fresh C <-> C++ APIs.

Side note here - look at all the code for orthogonality.

Bug: 162794619
Test: binder_parcel_fuzzer, libbinder_ndk_unit_test
Change-Id: Ia44213343eca53f08fb2d9ff96f8def084b8f600
diff --git a/libs/binder/ndk/Android.bp b/libs/binder/ndk/Android.bp
index 32e018d..33d28e6 100644
--- a/libs/binder/ndk/Android.bp
+++ b/libs/binder/ndk/Android.bp
@@ -57,6 +57,7 @@
     srcs: [
         "ibinder.cpp",
         "ibinder_jni.cpp",
+        "libbinder.cpp",
         "parcel.cpp",
         "parcel_jni.cpp",
         "process.cpp",