Add mkuserimg.sh, make_ext4fs to otatools

Change-Id: Id48d6643f4579d695685fe2595bd86a80a5083c3
diff --git a/core/Makefile b/core/Makefile
index a74f855..72d4ae7 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -864,7 +864,9 @@
 	  $(HOST_OUT_EXECUTABLES)/bsdiff \
 	  $(HOST_OUT_EXECUTABLES)/imgdiff \
 	  $(HOST_OUT_JAVA_LIBRARIES)/dumpkey.jar \
-	  $(HOST_OUT_JAVA_LIBRARIES)/signapk.jar
+	  $(HOST_OUT_JAVA_LIBRARIES)/signapk.jar \
+	  $(HOST_OUT_EXECUTABLES)/mkuserimg.sh \
+	  $(HOST_OUT_EXECUTABLES)/make_ext4fs
 
 .PHONY: otatools
 otatools: $(OTATOOLS)