Pack libdivsufsort.so into otatools.zip.

This is to support the change to bsdiff which depends on
libdivsufsort.so and libdivsufsort64.so now.

Bug: 24332905
Change-Id: I232fc1b2abda67456f012a83fa4f69a99bc6ea14
diff --git a/core/Makefile b/core/Makefile
index 6676bee..ed69855 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1344,6 +1344,8 @@
   $(HOST_LIBRARY_PATH)/libcutils$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libselinux$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libcrypto-host$(HOST_SHLIB_SUFFIX) \
+  $(HOST_LIBRARY_PATH)/libdivsufsort$(HOST_SHLIB_SUFFIX) \
+  $(HOST_LIBRARY_PATH)/libdivsufsort64$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libext2fs_host$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libext2_blkid_host$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libext2_com_err_host$(HOST_SHLIB_SUFFIX) \