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-

Zcash: Excludes byteswap.h change as we don't have bitcoin/bitcoin#9366.

src/util.cpp

@@ -699,7 +699,7 @@ void FileCommit(FILE *fileout)
 #else
     #if defined(__linux__) || defined(__NetBSD__)
     fdatasync(fileno(fileout));
-    #elif defined(__APPLE__) && defined(F_FULLFSYNC)
+    #elif defined(MAC_OSX) && defined(F_FULLFSYNC)
     fcntl(fileno(fileout), F_FULLFSYNC, 0);
     #else
     fsync(fileno(fileout));