libcutils: Fix warnings in properties.c when verbose logging is enabled

Change-Id: I07c5eb59b9395734ad3fc25eba753564c0f096a0
diff --git a/libcutils/tests/Android.mk b/libcutils/tests/Android.mk
index e9d3ed7..d3e07f8 100644
--- a/libcutils/tests/Android.mk
+++ b/libcutils/tests/Android.mk
@@ -19,7 +19,8 @@
     PropertiesTest.cpp \
 
 shared_libraries := \
-    libutils
+    libutils \
+    liblog
 
 static_libraries := \
     libcutils