Log Message:
Several changes rolled into one:

 o Wedge in DESTDIR support.  This is a little tricky since the
   installation procedure wants to run scotty to parse and dump
   the MIB files, and this needs to be done in DESTDIR.  Therefore
   we use the post-install target, to fix things up before packaging
   and the real install.

 o Fix the "dns" functionality not to use _res, since this program
   is linked with libpthread that won't work on NetBSD (aborts the
   program).  Though the modified version still uses a global static
   variable.

 o Add comments to all the patch files.

 o Eliminate use of ${WRKSRC}/.., since pkglint objects to it.  Instead
   use BUILD_DIRS and CONFIGURE_DIRS.

 o Add a LICENSE setting, 2-clause-bsd appears most similar.

 o Bump PKGREVISION for the above changes.