Upgrade Libretro frontend and cores to 17.05 release

- Remove Libretro symbols declaration
- Print core reports in run scenarios
- Run scenario fixups
- Fetch shareware Quake in TyrQuake scenario
- retro_frontend fixups

Ref #74

src/app/retro_frontend/callbacks.h

@@ -14,8 +14,12 @@
 #ifndef _RETRO_FRONTEND__CALLBACKS_H_
 #define _RETRO_FRONTEND__CALLBACKS_H_
 
+/* local includes */
 #include "frontend.h"
 
+/* Genode includes */
+#include <base/sleep.h>
+
 /* vsnprintf */
 #include <stdio.h>
 
@@ -126,8 +130,10 @@ bool environment_callback(unsigned cmd, void *data)
 	}
 
 	case RETRO_ENVIRONMENT_SHUTDOWN:
+		global_frontend->exit();
 		global_frontend->env.parent().exit(0);
-		return true;
+		/* can't return here, this is a callback */
+		Genode::sleep_forever();
 
 	case RETRO_ENVIRONMENT_GET_VARIABLE:
 	{

src/app/retro_frontend/frontend.h

@@ -116,7 +116,7 @@ struct Retro_frontend::Frontend
 	{
 
 		Dynamic_core(Genode::Env &env, Genode::Allocator &alloc, Name const &name)
-		: Genode::Shared_object(env, alloc, name.string(), BIND_NOW, DONT_KEEP)
+		: Genode::Shared_object(env, alloc, name.string(), BIND_LAZY, DONT_KEEP)
 		{
 			unsigned api_version = lookup<Retro_api_version>
 				("retro_api_version")();