Add VT_API before friend specification of a function that is later declared as TF_API.

Author: marktucker

pxr/base/vt/arrayEdit.h

@@ -195,7 +195,7 @@ class VtArrayEdit
     friend class VtArrayEditBuilder<ELEM>;
     friend struct Vt_ArrayEditHashAccess;
 
-    friend
+    VT_API friend
     std::ostream &Vt_ArrayEditStreamImpl(
         Vt_ArrayEditOps const &ops, size_t literalsSize,
         TfFunctionRef<std::ostream &(int64_t index)> elemToStr,