wrapfunction: use sysstr instead of bytes as argument in the "git" extension

This is as valid and simpler, it will help us to eventually get ride of
`safehasattr`.

hgext/git/__init__.py

@@ -342,8 +342,8 b' def _featuresetup(ui, supported):'
 
 
 def extsetup(ui):
-    extensions.wrapfunction(localrepo, b'makestore', _makestore)
-    extensions.wrapfunction(localrepo, b'makefilestorage', _makefilestorage)
+    extensions.wrapfunction(localrepo, 'makestore', _makestore)
+    extensions.wrapfunction(localrepo, 'makefilestorage', _makefilestorage)
     # Inject --git flag for `hg init`
     entry = extensions.wrapcommand(commands.table, b'init', init)
     entry[1].extend(

hgext/git/dirstate.py

@@ -47,7 +47,7 b' def readpatternfile(orig, filepath, warn'
     return result, warnings
 
 
-extensions.wrapfunction(matchmod, b'readpatternfile', readpatternfile)
+extensions.wrapfunction(matchmod, 'readpatternfile', readpatternfile)
 
 
 _STATUS_MAP = {}