core.certmanager: Include ffdhe2048 from RFC 7919 as default DH param This removes one manual (yet undocumented) step that was supposed to be done to get a complete 'intermediate' configuration. This file can be found on the Internet by searching for "ffdhe2048" and can be verified by comparing the hexadecimal representation of p from the RFC with the output of `openssl asn1parse`. Given the preference and prevalence of ECDHE, it seems likely that few would have noticed this.

local xpcall = xpcall;

if select(2, xpcall(function (x) return x end, function () end,  "test")) ~= "test" then
	xpcall = require"prosody.util.compat".xpcall;
end

return {
	xpcall = xpcall;
};