Makefile: Pack squashfs and f2fs tools into otatools.zip.

The following tools are essential to create squashfs and f2fs images
during signing (if applicable).

squashfs: mksquashfs and mksquashfsimage.sh
f2fs: make_f2fs and mkf2fsuserimg.sh

Bug: 28179154
Change-Id: Ia48bc6d9a40d2667bc6f2c973bd0c55eed7a06fc
diff --git a/core/Makefile b/core/Makefile
index 1257e15..7950501 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1487,6 +1487,10 @@
   $(HOST_OUT_JAVA_LIBRARIES)/BootSignature.jar \
   $(HOST_OUT_EXECUTABLES)/mkuserimg.sh \
   $(HOST_OUT_EXECUTABLES)/make_ext4fs \
+  $(HOST_OUT_EXECUTABLES)/mksquashfsimage.sh \
+  $(HOST_OUT_EXECUTABLES)/mksquashfs \
+  $(HOST_OUT_EXECUTABLES)/mkf2fsuserimg.sh \
+  $(HOST_OUT_EXECUTABLES)/make_f2fs \
   $(HOST_OUT_EXECUTABLES)/simg2img \
   $(HOST_OUT_EXECUTABLES)/e2fsck \
   $(HOST_OUT_EXECUTABLES)/build_verity_tree \