Remove hb_auto_array_t

Part of https://github.com/harfbuzz/harfbuzz/issues/1017

src/hb-coretext.cc

diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
index bb9b5ca..837b3fb 100644
--- a/src/hb-coretext.cc
+++ b/src/hb-coretext.cc
@@ -641,8 +641,8 @@
 	buffer->merge_clusters (i - 1, i + 1);
   }
 
-  hb_auto_array_t<feature_record_t> feature_records;
-  hb_auto_array_t<range_record_t> range_records;
+  hb_auto_t<hb_vector_t<feature_record_t> > feature_records;
+  hb_auto_t<hb_vector_t<range_record_t> > range_records;
 
   /*
    * Set up features.
@@ -651,7 +651,7 @@
   if (num_features)
   {
     /* Sort features by start/end events. */
-    hb_auto_array_t<feature_event_t> feature_events;
+    hb_auto_t<hb_vector_t<feature_event_t> > feature_events;
     for (unsigned int i = 0; i < num_features; i++)
     {
       const feature_mapping_t * mapping = (const feature_mapping_t *) bsearch (&features[i].tag,
@@ -700,7 +700,7 @@
     }
 
     /* Scan events and save features for each range. */
-    hb_auto_array_t<active_feature_t> active_features;
+    hb_auto_t<hb_vector_t<active_feature_t> > active_features;
     unsigned int last_index = 0;
     for (unsigned int i = 0; i < feature_events.len; i++)
     {