irc/ircd-hybrid: Updates to 8.2.31

Changes since 8.2.30:

• Noteworthy changes in version 8.2.31 (2020-05-03)

o) macOS compatibility fixes
o) Removed 'spoof_notice' from auth::flags. With vhosts now this notice doesn't make

much sense anymore

o) Fixed issue where ban masks might become malformed if set by remote clients/servers
o) Fixed issue with channel mode +c where high ascii characters can be erroneously

detected as control characters

o) For a full list of all changes in this release, see https://git.io/JfsmV