Makefile: Add the missing library in otatools.zip.

With the change in [1], delta_generator now needs
libprotobuf-cpp-lite.so instead of libprotobuf-cpp-lite-rtti.so to
generate A/B payloads.

[1] commit ab5bd668f6be600a8cceb8772e426c0aa902a5e1

Bug: 27145830
Change-Id: Ib9a93bf0fbe7fa44fc5fb94668d17fa1a2e07b05
(cherry picked from commit fdd2693b650d24d98dd694508724b901f50f278f)
diff --git a/core/Makefile b/core/Makefile
index 9a48a9d..7bb9d17 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1468,7 +1468,7 @@
   $(HOST_LIBRARY_PATH)/libchrome$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libcurl-host$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libevent-host$(HOST_SHLIB_SUFFIX) \
-  $(HOST_LIBRARY_PATH)/libprotobuf-cpp-lite-rtti$(HOST_SHLIB_SUFFIX) \
+  $(HOST_LIBRARY_PATH)/libprotobuf-cpp-lite$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libssl-host$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libz-host$(HOST_SHLIB_SUFFIX)