moduleapi: Fix handling of replies to :send_iq from internal modules Unclear exactly why, but replies to some queries to local modules would be discarded by stanza_router. This appears to fix it.

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;
};