scripted-diff: prefer MAC_OSX over __APPLE__

-BEGIN VERIFY SCRIPT-
sed -i 's/__APPLE__/MAC_OSX/g' src/compat/byteswap.h src/util.cpp
-END VERIFY SCRIPT-

src/util.cpp

@@ -1021,7 +1021,7 @@ bool FileCommit(FILE *file)
         LogPrintf("%s: fdatasync failed: %d\n", __func__, errno);
         return false;
     }
-    #elif defined(__APPLE__) && defined(F_FULLFSYNC)
+    #elif defined(MAC_OSX) && defined(F_FULLFSYNC)
     if (fcntl(fileno(file), F_FULLFSYNC, 0) == -1) { // Manpage says "value other than -1" is returned on success
         LogPrintf("%s: fcntl F_FULLFSYNC failed: %d\n", __func__, errno);
         return false;