Update Makefile.libretro (#59)

Author: Ploggy

Makefile.libretro

@@ -259,6 +259,7 @@ else ifeq ($(platform), wiiu)
  CC = $(DEVKITPPC)/bin/powerpc-eabi-gcc$(EXE_EXT)
  AR = $(DEVKITPPC)/bin/powerpc-eabi-ar$(EXE_EXT)
  CFLAGS += -DGEKKO -DWIIU -DHW_RVL -mrvl -mcpu=750 -meabi -mhard-float -DMSB_FIRST -D__ppc__
+ CFLAGS += -ffunction-sections -fdata-sections -D__wiiu__ -D__wut__
  STATIC_LINKING = 1
  HAS_GPU=0