Remove libastl and libastl_host from the grandfathered list.

astl is dead.

Change-Id: I123d1de9da23576c76772a6c9b73046aa0d189ef
diff --git a/core/user_tags.mk b/core/user_tags.mk
index 13655fd..90c0b23 100644
--- a/core/user_tags.mk
+++ b/core/user_tags.mk
@@ -174,8 +174,6 @@
 	libandroid_runtime \
 	libandroid_servers \
 	libarity \
-	libastl \
-	libastl_host \
 	libaudio \
 	libaudioeffect_jni \
 	libaudioflinger \