don't send multiline responses to CAP LS 301 #2068
Merged
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This is more or less explicitly prohibited by the spec:
https://ircv3.net/specs/extensions/capability-negotiation.html#multiline-replies-to-cap-ls-and-cap-list
See progval/irctest#205 ; #2065 here caused the CAP LS 301 response to spill onto two lines, breaking SASL in irssi and possibly other clients.