Don't manually link stlport.

Change-Id: I60d2bc868fb9052f120103e9675046ef54f510d0
diff --git a/libcutils/tests/Android.mk b/libcutils/tests/Android.mk
index 2b3a9ee..76db5b1 100644
--- a/libcutils/tests/Android.mk
+++ b/libcutils/tests/Android.mk
@@ -41,9 +41,9 @@
     libc \
     libcutils \
     liblog \
-    libstlport_static \
     libutils \
 
+LOCAL_CXX_STL := stlport_static
 LOCAL_MULTILIB := both
 LOCAL_MODULE_STEM_32 := $(LOCAL_MODULE)32
 LOCAL_MODULE_STEM_64 := $(LOCAL_MODULE)64