Log Message:
neomutt: update to 20200424.

2020-04-24  Richard Russon  <rich@flatcap.org>
* Bug Fixes
  -Fix history corruption
  -Handle pretty much anything in a URL query part
  -Correctly parse escaped characters in header phrases
  -Fix crash reading received header
  -Fix sidebar indentation
  -Avoid crashing on failure to parse an IMAP mailbox
  -Maildir: handle deleted emails correctly
  -Ensure OP_NULL is always first
* Translations
  -100% Czech
* Build
  -cirrus: enable pcre2, make pkgconf a special case
  -Fix finding pcre2 w/o pkgconf
  -build: tdb.h needs size_t, bring it in with stddef.h