Always link libdl with libc++ for the NDK.

libc++ requires libdl whether it's statically linked or not.

Test: make checkbuild tests
Bug: None
Change-Id: I8abdcfaef779b358196716ab1193cebe278317ac
diff --git a/core/binary.mk b/core/binary.mk
index b9cff65..828dcdb 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -216,7 +216,6 @@
     ifneq (,$(filter r10 r11,$(LOCAL_NDK_VERSION)))
       ifeq (c++_static,$(LOCAL_NDK_STL_VARIANT))
         my_ndk_stl_static_lib := $(my_libcxx_libdir)/libc++_static.a
-        my_ldlibs += -ldl
       else
         my_ndk_stl_shared_lib_fullpath := $(my_libcxx_libdir)/libc++_shared.so
       endif
@@ -225,7 +224,6 @@
         my_ndk_stl_static_lib := \
           $(my_libcxx_libdir)/libc++_static.a \
           $(my_libcxx_libdir)/libc++abi.a
-        my_ldlibs += -ldl
       else
         my_ndk_stl_shared_lib_fullpath := $(my_libcxx_libdir)/libc++_shared.so
       endif
@@ -236,6 +234,8 @@
       endif
     endif
 
+    my_ldlibs += -ldl
+
     my_ndk_stl_cppflags := -std=c++11
   else # LOCAL_NDK_STL_VARIANT is not c++_* either
   ifneq (,$(filter gnustl_%, $(LOCAL_NDK_STL_VARIANT)))