wrapfunction: use sysstr instead of bytes as argument in "remotefilelog"
This is as valid and simpler, it will help us to eventually get ride of
`safehasattr`.
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init repo
$ cd repo
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state