fixup for 64-bit windows build

src/hb-uniscribe.cc

diff --git a/src/hb-uniscribe.cc b/src/hb-uniscribe.cc
index 905ad5e..6571448 100644
--- a/src/hb-uniscribe.cc
+++ b/src/hb-uniscribe.cc
@@ -709,7 +709,7 @@
     for (unsigned int i = 0; i < range_records.len; i++)
     {
       range_record_t *range = &range_records[i];
-      range->props.potfRecords = feature_records.array + reinterpret_cast<unsigned int> (range->props.potfRecords);
+      range->props.potfRecords = feature_records.array + reinterpret_cast<uintptr_t> (range->props.potfRecords);
     }
   }
   else