Try fixing AppVeyor bots

diff --git a/src/hb-private.hh b/src/hb-private.hh
index 9691b086d36ace0cb73e772c750f384ecdd3e62e..ea6a8fa47103d1ea60cd46629a10a1be33880bf7 100644 (file)
--- a/src/hb-private.hh
+++ b/src/hb-private.hh
@@ -93,7 +93,8 @@ public:
     }
 private:
     void operator&() const;    // whose address can't be taken
-} nullptr = {};                // and whose name is nullptr
+} _hb_nullptr = {};            // and whose name is nullptr
+#define nullptr _hb_nullptr
 
 // Static assertions
 #ifndef static_assert