Make core need_fullpath = false and pass memory buffer and size

of ROM from frontend to core

src/driver.h

@@ -115,8 +115,12 @@ void FCEUI_DisableSpriteLimitation(int a);
 /* -1 = no change, 0 = show, 1 = hide, 2 = internal toggle */
 void FCEUI_SetRenderDisable(int sprites, int bg);
 
+#ifdef __LIBRETRO__
+FCEUGI *FCEUI_LoadGame(const char *name, uint8_t *buf, size_t bufsize);
+#else
 /* name=path and file to load.  returns 0 on failure, 1 on success */
 FCEUGI *FCEUI_LoadGame(const char *name);
+#endif
 
 #ifdef COPYFAMI
 /* Fake UNIF board to start new CFHI instance */