Move art host to libc++

Change-Id: Ia51a4fdfdbae7377130a43c401c2d8d241671d1e
diff --git a/build/Android.executable.mk b/build/Android.executable.mk
index 3c33975..a186e85 100644
--- a/build/Android.executable.mk
+++ b/build/Android.executable.mk
@@ -99,8 +99,8 @@
     LOCAL_MULTILIB := $$(art_multilib)
   endif
 
+  include external/libcxx/libcxx.mk
   ifeq ($$(art_target_or_host),target)
-    include external/libcxx/libcxx.mk
     include $(BUILD_EXECUTABLE)
     ART_TARGET_EXECUTABLES := $(ART_TARGET_EXECUTABLES) $(TARGET_OUT_EXECUTABLES)/$$(LOCAL_MODULE)
   else # host