Use arrayZ on hb-coretext and hb-uniscribe and fix macOS/Win bots (#1024)

Following to 63f57f4

src/hb-coretext.cc

diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
index 837b3fb..3924c8e 100644
--- a/src/hb-coretext.cc
+++ b/src/hb-coretext.cc
@@ -777,7 +777,7 @@
       } else {
         active_feature_t *feature = active_features.find (&event->feature);
 	if (feature)
-	  active_features.remove (feature - active_features.array);
+	  active_features.remove (feature - active_features.arrayZ);
       }
     }
   }