Add PS2 support in Makefile

Makefile.libretro

@@ -182,6 +182,19 @@ else ifeq ($(platform), psl1ght)
 	STATIC_LINKING = 1
 	HAVE_COMPAT = 1
 
+# PS2
+else ifeq ($(platform), ps2)
+	TARGET := $(TARGET_NAME)_libretro_$(platform).a
+	CC = ee-gcc$(EXE_EXT)
+	CC_AS = ee-gcc$(EXE_EXT)
+	CXX = ee-g++$(EXE_EXT)
+	AR = ee-ar$(EXE_EXT)
+	PLATFORM_DEFINES := -DPS2 -DBGR
+	CFLAGS += -G0
+	CXXFLAGS += -G0
+	STATIC_LINKING = 1
+	HAVE_COMPAT = 1
+
 # PSP
 else ifeq ($(platform), psp1)
 	TARGET := $(TARGET_NAME)_libretro_$(platform).a