Add code to osx target

Makefile.libretro

@@ -73,6 +73,17 @@ else ifeq ($(platform), osx)
    TARGET := $(TARGET_NAME)_libretro.$(EXT)
    fpic := -fPIC
    SHARED := -dynamiclib
+	ifeq ($(arch),ppc)
+		ENDIANNESS_DEFINES += -DMSB_FIRST
+	endif
+	OSXVER = `sw_vers -productVersion | cut -d. -f 2`
+	OSX_LT_MAVERICKS = `(( $(OSXVER) <= 9)) && echo "YES"`
+	fpic += -mmacosx-version-min=10.1
+	ifndef ($(NOUNIVERSAL))
+		CFLAGS += $(ARCHFLAGS)
+		LDFLAGS += $(ARCHFLAGS)
+	endif
+
 # iOS
 else ifneq (,$(findstring ios,$(platform)))
 	EXT?=dylib