ARROW-17157: Restored Windows export as map node is needed by dataset…

…s module for tee node so I think I'll have to figure out why it causes duplicate symbols

cpp/src/arrow/compute/exec/map_node.h

@@ -42,7 +42,7 @@
 namespace arrow {
 namespace compute {
 
-class MapNode : public ExecNode {
+class ARROW_EXPORT MapNode : public ExecNode {
  public:
   MapNode(ExecPlan* plan, std::vector<ExecNode*> inputs,
           std::shared_ptr<Schema> output_schema, bool async_mode);