o Bump SHLIB_VERSION to 4 and make this port build it that way.
o Look for perl in the right place (patch-ah)
o Add a typedef that ucd-snmp wants (patch-ag)
o Install headers files with the right permissions

Submitted by: <jack@germanium.xtalwind.net>

PR: ports/13539

o Remove extraneous HAS_CONFIGURE introduced by nectar in rev1.19
o Use the PATCH_* framework and grab 012.patch from the authors.