py3: bytestr() bytes to get bytechar while iterating on it

Iterating on bytes give you ascii values instead of bytechr so we need to wrap
the bytes in pycompat.bytestr() to get bytechr while iterating.

Differential Revision: https://phab.mercurial-scm.org/D3609

mercurial/patch.py

@@ -1946,7 +1946,7 b' def applybindelta(binchunk, data):'
     """
     def deltahead(binchunk):
         i = 0
-        for c in binchunk:
+        for c in pycompat.bytestr(binchunk):
             i += 1
             if not (ord(c) & 0x80):
                 return i

mercurial/templater.py

@@ -253,7 +253,8 b' def _scantemplate(tmpl, start, stop, quo'
     p = parser.parser(elements)
     try:
         while pos < stop:
-            n = min((tmpl.find(c, pos, stop) for c in sepchars),
+            n = min((tmpl.find(c, pos, stop)
+                     for c in pycompat.bytestr(sepchars)),
                     key=lambda n: (n < 0, n))
             if n < 0:
                 yield ('string', unescape(tmpl[pos:stop]), pos)