LibCore: Add a hook for custom construction of EventLoopImplementation

Author: https://github.com/awesomekling
Commit: 31289a8d57
Pull-request: https://github.com/SerenityOS/serenity/pull/18493
Reviewed-by: https://github.com/FireFox317

Userland/Libraries/LibCore/EventLoopImplementationUnix.h

@@ -12,6 +12,8 @@ namespace Core {
 
 class EventLoopImplementationUnix final : public EventLoopImplementation {
 public:
+    static NonnullOwnPtr<EventLoopImplementationUnix> create() { return make<EventLoopImplementationUnix>(); }
+
     EventLoopImplementationUnix();
     virtual ~EventLoopImplementationUnix();