Log Message:
update to ircii 20210314.  changes include:

  o  fix two memory leaks, one from michael ortmann <ortmann@posteo.de>
  o  fixes for various issues by michael ortmann <ortmann@posteo.de>
  o  new --with-sanitizer=<asan|ubsan|lsan> configure support
  o  many fixes for fuzzer and sanitizer found issues
  o  the $IRCSERVERS variable no longer triggers some library asserts
  o  avoid displaying negative hours/minutes
  o  fix a potential messages goes to wrong window issue in numerics