Add Windows build with clang

namecollision/hello.cpp

@@ -1,5 +1,11 @@
 #include <iostream>
 
+#ifdef _WIN32
+#define EXPORT __declspec(dllexport)
+#else
+#define EXPORT
+#endif
+
 using namespace std;
 
 class nt {
@@ -9,7 +15,7 @@ public:
     }
 };
 
-void print_obj() {
+EXPORT void print_obj() {
     cout << "Hello from function\n";
     nt obj;
     obj.print();