Switch ceres from stlport to libc++

Change-Id: I02c6604c461a1669b40b29b1efaa751ad576729c
diff --git a/Android.mk b/Android.mk
index 7e5a993..ac262aa 100644
--- a/Android.mk
+++ b/Android.mk
@@ -56,7 +56,7 @@
 LOCAL_MODULE := libceres
 
 LOCAL_SDK_VERSION := 17
-LOCAL_NDK_STL_VARIANT := stlport_static
+LOCAL_NDK_STL_VARIANT := c++_static
 
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/internal \
                     $(LOCAL_PATH)/internal/ceres \