Switch ART to libc++.

TODO: remove all vestiges of stlport.

Change-Id: I95a3cb0b53d0898f0a5d388b606e79522f4d85e0
diff --git a/build/Android.executable.mk b/build/Android.executable.mk
index 6aa1c18..683d91d 100644
--- a/build/Android.executable.mk
+++ b/build/Android.executable.mk
@@ -56,7 +56,7 @@
   LOCAL_MODULE_TAGS := optional
   LOCAL_SRC_FILES := $$(art_source)
   LOCAL_C_INCLUDES += $(ART_C_INCLUDES) art/runtime $$(art_c_includes)
-  LOCAL_SHARED_LIBRARIES += $$(art_shared_libraries) # libnativehelper
+  LOCAL_SHARED_LIBRARIES += $$(art_shared_libraries)
 
   ifeq ($$(art_ndebug_or_debug),ndebug)
     LOCAL_MODULE := $$(art_executable)