Add test build.

Change-Id: Ia7f6296559e5eabe1ea797a05bcb524d6faaf5dc
diff --git a/mbtk/Makefile b/mbtk/Makefile
index 322d28f..5241eda 100755
--- a/mbtk/Makefile
+++ b/mbtk/Makefile
@@ -18,7 +18,7 @@
 DIRS += aboot-tiny mbtk_adbd mbtk_logd mbtk_utils mbtk_utils_linux mbtk_gnssd
 
 # Build test file.
-#DIRS += test
+DIRS += test
 
 #exclude_dirs := include bin
 #test_dirs := $(shell find test/ -maxdepth 1 -type d)