remove duplicate macros on Darwin/*BSD

adk/include/endian.h

@@ -7,24 +7,12 @@
 #elif defined(__APPLE__)
 #include <machine/endian.h>
 #include <machine/byte_order.h>
-#define bswap_16(x) NXSwapShort(x)
-#define bswap_32(x) NXSwapInt(x)
-#define bswap_64(x) NXSwapLongLong(x)
 #elif defined(__FreeBSD__)
 #include <sys/endian.h>
-#define bswap_16(x) bswap16(x)
-#define bswap_32(x) bswap32(x)
-#define bswap_64(x) bswap64(x)
 #elif defined(__OpenBSD__)
 #include <sys/types.h>
-#define bswap_16(x) __swap16(x)
-#define bswap_32(x) __swap32(x)
-#define bswap_64(x) __swap64(x)
 #else
 #include <machine/endian.h>
-#define bswap_16(x) swap16(x)
-#define bswap_32(x) swap32(x)
-#define bswap_64(x) swap64(x)
 #endif
 
 #ifndef __BYTE_ORDER