Add -ldl for new stlport

The new stlport in NDK r8d+ supports exception support via gabi++.
The new gabi++ depends on dlopen, etc, meaning that we need to add -ldl
for project links stlport with "-nostdlib -Wl,--no-undefined"
(ie. all *.so in Android)

Change-Id: I7321a075d2852a6a72f82f40bb24d64ec211cf39

native/jni/Android.mk

@@ -95,6 +95,7 @@ LOCAL_MODULE_TAGS := optional
 
 LOCAL_SDK_VERSION := 14
 LOCAL_NDK_STL_VARIANT := stlport_static
+LOCAL_LDFLAGS += -ldl
 
 include $(BUILD_SHARED_LIBRARY)