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posix platform: remove unused macros

--- a/posix/platform.h

+++ b/posix/platform.h

@@ -63,18 +63,6 @@

 #define __likely(x) __builtin_expect(!!(x), 1)

 #endif

-#ifdef HAVE_BYTESWAP

-#include <byteswap.h>

-#else

-#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)

-#define bswap_32(x) \

-    ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \

-    (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))

-#define bswap_64(x) \

-    (uint64_t)bswap_32((x) & 0xffffffffULL)<<32 | \

-    (uint64_t)bswap_32(((x)>>32) & 0xffffffffULL)

-#endif

-

 #define PATHSEP '/'

 #define PATHSEPSTRING "/"

 #define PATHLISTSEP ':'

@@ -89,7 +77,3 @@

 #include "mp.h"

 #include "utf.h"

-

-#ifndef HAVE_BITREVERSE32

-uint32_t __builtin_bitreverse32(uint32_t x);

-#endif