Add GCW Zero target

Makefile.libretro

@@ -355,6 +355,29 @@ else ifneq (,$(findstring armv,$(platform)))
 	endif
 	ARCH = arm
 
+# GCW0
+else ifeq ($(platform), gcw0)
+	TARGET := $(TARGET_NAME)_libretro.so
+	CC = /opt/gcw0-toolchain/usr/bin/mipsel-linux-gcc
+	AR = /opt/gcw0-toolchain/usr/bin/mipsel-linux-ar
+	SHARED := -shared -nostdlib
+        fpic := -fPIC
+	LIBM :=
+	DONT_COMPILE_IN_ZLIB = 1
+	CFLAGS += -ffast-math -march=mips32 -mtune=mips32r2 -mhard-float
+
+	asm_memory = 0
+	asm_render = 0
+	asm_ym2612 = 0
+	asm_misc = 0
+	asm_cdpico = 0
+	asm_cdmemory = 0
+	asm_mix = 0
+	use_cyclone = 0
+	use_fame = 1
+	use_drz80 = 0
+	use_cz80 = 1
+
 # Windows
 else
 	TARGET := $(TARGET_NAME)_libretro.dll