Add header for dlls

WIN-packages/dialogs_win.h

@@ -0,0 +1,11 @@
+extern "C" {
+#ifndef JUCI_C_DIALOGS
+#define JUCI_C_DIALOGS
+	__declspec(dllimport) const char* c_select_folder();
+	__declspec(dllimport) const char* c_select_file();
+	__declspec(dllimport) const char* c_new_file();
+	__declspec(dllimport) const char* c_new_folder();
+	__declspec(dllimport) const char* c_save_file();
+#endif  // JUCI_C_DIALOGS
+};
+

src/dialogs_win.cc

@@ -1,6 +1,6 @@
 #ifdef _WIN32
 #include "dialogs.h"
-#include <c_dialogs.h>
+#include <dialogs_win.h>
 
 std::string Dialog::select_folder() {
   return c_select_folder();