contrib: byteify perf.py file
This is done using contrib/byteify-strings.py. There is just one extra change
done to make sure lines don't get longer than 80 chars.
# skip-blame because just b'' prefixes.
Differential Revision: https://phab.mercurial-scm.org/D4422
<Include>
<?if $(var.Platform) = "x64" ?>
<?define IsX64 = yes ?>
<?else?>
<?define IsX64 = no ?>
<?endif?>
</Include>