- Update keyring as per https://nlnetlabs.nl/people/

- New upstream release 4.2.4
FEATURES:
- Fix #48: Add make distclean that removes config.h made by configure.
And add maintainer-clean that removes bison and flex output.
BUG FIXES:
- Detect fixed time memcmp for openssl 0.9.8 compatibility.
- Detect EC_KEY_new_by_curve_name for openssl 0.9.8.
- include limits.h for UINT_MAX.
- If no recvmmsg, dont use msg_flags member, but errno for error,
where our fallback function left it, msg_flags also does not exist
on some systems.
- Remove unused variable warning for portability.
- Fix #52: do not log transient network full errors unless higher
verbosity is set.
- Fix regressions in configparser.y where global variables were not
set for minimal-responses, round-robin and log-time-ascii.