make android.InList generic

Change-Id: Ic166216cb473371a5e34cd97a068ca35f5534740
diff --git a/cc/util.go b/cc/util.go
index 6d8ac43..c93646b 100644
--- a/cc/util.go
+++ b/cc/util.go
@@ -28,8 +28,8 @@
 	return android.JoinWithPrefix(dirs.Strings(), "-I")
 }
 
-var indexList = android.IndexList
-var inList = android.InList
+var indexList = android.IndexList[string]
+var inList = android.InList[string]
 var filterList = android.FilterList
 var removeListFromList = android.RemoveListFromList
 var removeFromList = android.RemoveFromList