Use bspatch from external/bsdiff.

Now ApplyBSDiffPatch() will stream the output to sink as we go instead
of sinking everything at the end.

Test: recovery_host_test
Bug: 26982501

Change-Id: I05b6ed40d45e4b1b19ae72784cf705b731b976e3
diff --git a/updater/Android.mk b/updater/Android.mk
index ac26bf4..3a47dac 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -24,6 +24,7 @@
 
 updater_common_static_libraries := \
     libapplypatch \
+    libbspatch \
     libedify \
     libziparchive \
     libotautil \