Rename sort() to qsort()

In an effort to make the algorithm used clear.
diff --git a/src/hb-uniscribe.cc b/src/hb-uniscribe.cc
index 6571448..f699415 100644
--- a/src/hb-uniscribe.cc
+++ b/src/hb-uniscribe.cc
@@ -631,7 +631,7 @@
       event->start = false;
       event->feature = feature;
     }
-    feature_events.sort ();
+    feature_events.qsort ();
     /* Add a strategic final event. */
     {
       active_feature_t feature;
@@ -663,7 +663,7 @@
 
 	unsigned int offset = feature_records.len;
 
-	active_features.sort ();
+	active_features.qsort ();
 	for (unsigned int j = 0; j < active_features.len; j++)
 	{
 	  if (!j || active_features[j].rec.tagFeature != feature_records[feature_records.len - 1].tagFeature)