Pack libsquashfs_utils.so into otatools.zip.

Overlooked the transitive dependency on this lib in my previous CL that
packs libfec.so.

Bug: 122280472
Test: Build `otatools.zip`. Unzip and check that
      `ldd bin/delta_generator` no longer shows any missing lib.
Change-Id: I7b633ea870f05b86ee7760c736dac7c74dee5dc2
diff --git a/core/Makefile b/core/Makefile
index c5dbe24..c5fda89 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -3283,7 +3283,8 @@
   $(HOST_LIBRARY_PATH)/libbrotli$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/liblp$(HOST_SHLIB_SUFFIX) \
   $(HOST_LIBRARY_PATH)/libext4_utils$(HOST_SHLIB_SUFFIX) \
-  $(HOST_LIBRARY_PATH)/libfec$(HOST_SHLIB_SUFFIX)
+  $(HOST_LIBRARY_PATH)/libfec$(HOST_SHLIB_SUFFIX) \
+  $(HOST_LIBRARY_PATH)/libsquashfs_utils$(HOST_SHLIB_SUFFIX)
 
 
 .PHONY: otatools