Add Rpi2 platform defines.

Makefile.libretro

@@ -158,6 +158,15 @@ else ifeq ($(platform), ctr)
 	STATIC_LINKING = 1
 	EXTERNAL_ZLIB = 1
 
+# Raspberry Pi 2
+else ifeq ($(platform), rpi2)
+	TARGET := $(TARGET_NAME)_libretro.so
+	fpic := -fPIC
+	SHARED := -shared -Wl,--version-script=libretro/link.T -Wl,--no-undefined
+	CFLAGS += -DARM
+	CFLAGS += -marm -mcpu=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard -funsafe-math-optimizations
+	CFLAGS += -fomit-frame-pointer -ffast-math
+
 # Lightweight PS3 Homebrew SDK
 else ifeq ($(platform), psl1ght)
 	TARGET := $(TARGET_NAME)_libretro_psl1ght.a