Log Message:
Changes 5.4.2:
snmplib:
- [PATCH 1921861]: Avoid endless loop after truncating 64bit int
- Better handling of CONTAINER_INSERT failures with multiple indices

snmpd:
- [PATCH 2023633]: add SCTP-MIB implementation (Linux only)
- suppress annoying "registration != duplicate" warning for root oids

build:
- [BUG 2023803]: Compilation problems on HP-UX 11.31
- Update to libtool 1.5.26

AIX:
- Add support for AIX 6.x.