plugin: include missing congif.h

Change-Id: I63aa6da414306a217e36c0f4f647d84486a8c5dd

src/client/plugin_manager_interface.cpp

@@ -20,6 +20,10 @@
 
 #include "plugin_manager_interface.h"
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif // HAVE_CONFIG_H
+
 #ifdef ENABLE_PLUGIN
 #include "manager.h"
 #include "plugin/jamipluginmanager.h"