add syspatch support to updater

Add the syspatch() function, which can apply xdelta3+xz patches using
the libsyspatch library.

Change-Id: Idc1921e449020923bcaf425a1983bec0833e47ed
diff --git a/updater/Android.mk b/updater/Android.mk
index 67e98ec..2e92504 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -35,6 +35,8 @@
 LOCAL_STATIC_LIBRARIES += libselinux
 LOCAL_C_INCLUDES += $(LOCAL_PATH)/..
 
+LOCAL_STATIC_LIBRARIES += libsyspatch libxz libxdelta3
+
 # Each library in TARGET_RECOVERY_UPDATER_LIBS should have a function
 # named "Register_<libname>()".  Here we emit a little C function that
 # gets #included by updater.c.  It calls all those registration