64-bit native utils.

* Update Application.mk.
* 64-bit libnative-utils
* New build of x86 and armeabi-v7a libnative-utils.
* Update to API19.

jni/Application.mk

@@ -1,5 +1,6 @@
-APP_ABI := armeabi armeabi-v7a x86
-APP_PLATFORM := android-9
-APP_STL := stlport_static
+# Built with NDK 19.2.5345600
+APP_ABI      := armeabi-v7a x86 arm64-v8a x86_64
+APP_PLATFORM := android-19
+APP_STL      := c++_static
 APP_CPPFLAGS += -fexceptions
-APP_OPTIM := debug
+APP_OPTIM    := debug