Add libnx build target (without dynarec)

Makefile

@@ -197,12 +197,16 @@ else ifeq ($(platform), psl1ght)
 	CFLAGS += -DMSB_FIRST -D__ppc__
 	STATIC_LINKING = 1
 
-# Nintendo Switch (libtransistor)
-else ifeq ($(platform), switch)
-	EXT=a
-        TARGET := $(TARGET_NAME)_libretro_$(platform).$(EXT)
-        include $(LIBTRANSISTOR_HOME)/libtransistor.mk
-        STATIC_LINKING=1
+# Nintendo Switch (libnx)
+else ifeq ($(platform), libnx)
+	include $(DEVKITPRO)/libnx/switch_rules
+	TARGET := $(TARGET_NAME)_libretro_$(platform).a
+	CFLAGS += -O3 -fomit-frame-pointer -ffast-math -I$(DEVKITPRO)/libnx/include/
+	CFLAGS += -specs=$(DEVKITPRO)/libnx/switch.specs
+	CFLAGS += -D__SWITCH__ -DHAVE_LIBNX
+	CFLAGS += -DARM -D__aarch64__=1 -march=armv8-a -mtune=cortex-a57 -mtp=soft -ffast-math
+	STATIC_LINKING=1
+	STATIC_LINKING_LINK = 1
 
 # Nintendo Game Cube / Wii / WiiU
 else ifneq (,$(filter $(platform), ngc wii wiiu))