correct way of detecting OS X

git-svn-id: https://svn.xiph.org/trunk/Tremor@14419 0101bb08-14d6-0310-b084-bc0e0c8e3800

os_types.h

@@ -57,7 +57,7 @@
    typedef UInt32 ogg_uint32_t;
    typedef SInt64 ogg_int64_t;
 
-#elif defined(__MACOSX__) /* MacOS X Framework build */
+#elif (defined(__APPLE__) && defined(__MACH__)) /* MacOS X Framework build */
 
 #  include <sys/types.h>
    typedef int16_t ogg_int16_t;