Revert "add memory hooks for cheat/rumble"

src/libretro.cpp

@@ -18,8 +18,6 @@ extern "C"
 #include <gamedb/sha1.h>
 }
 
-extern BYTE memory[];
-
 #define RETRO_DEVICE_SINCLAIR_KEYBOARD RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_KEYBOARD, 0)
 #define RETRO_DEVICE_CURSOR_JOYSTICK   RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 0)
 
@@ -395,15 +393,11 @@ bool retro_load_game( const struct retro_game_info* info )
 
 size_t retro_get_memory_size( unsigned id )
 {
-  if ( id == RETRO_MEMORY_SYSTEM_RAM )
-    return 1024*1024 ;
   return 0;
 }
 
 void* retro_get_memory_data( unsigned id )
 {
-  if ( id == RETRO_MEMORY_SYSTEM_RAM )
-    return memory ;
   return NULL;
 }