Libretro: Fix Wii compiling by adding required -ffat-lto-objects

Otherwise when compiling the final dol will result in compilation errors because of missing Libretro dependencies.
(dirty, quick-fix) workaround for stop the compiler messages of "plugin needed to handle lto object"

Makefile.libretro

@@ -276,7 +276,7 @@ else ifeq ($(platform), wii)
 	TARGET := $(TARGET_NAME)_libretro_$(platform).a
 	CC = $(DEVKITPPC)/bin/powerpc-eabi-gcc$(EXE_EXT)
 	AR = $(DEVKITPPC)/bin/powerpc-eabi-ar$(EXE_EXT)
-	CFLAGS += -DGEKKO -DHW_RVL -mrvl -mcpu=750 -meabi -mhard-float
+	CFLAGS += -DGEKKO -DHW_RVL -mrvl -mcpu=750 -meabi -mhard-float -ffat-lto-objects
 	STATIC_LINKING = 1
 	STATIC_LINKING_LINK = 1