Fixed build issues for non gcc compilers.

src/dtkDistributed/dtkDistributedArray.h

@@ -36,6 +36,10 @@ public:
 
 template<typename T> class dtkDistributedArray : public dtkDistributedContainer
 {
+public:
+    class item;
+    class iterator;
+
 public:
      inline  dtkDistributedArray(const qlonglong& count, dtkDistributedWorker *worker);
      inline ~dtkDistributedArray(void);