util.stanza: Allow U+7F
Allowed by XML despite arguably being a control character.
Drops the part of the range meant to rule out octets invalid in UTF-8
(\247 starts a 4-byte sequence), since UTF-8 correctness is validated by
util.encodings.utf8.valid().
local xpcall = xpcall;
if select(2, xpcall(function (x) return x end, function () end, "test")) ~= "test" then
xpcall = require"util.compat".xpcall;
end
return {
xpcall = xpcall;
};