Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Update share/examples/* to properly install /usr/share/examples.

As result of this, a new examples package is now created.

Note, this is only effective with 'SHARED=copies' (the default),
as the 'SHARED=symlinks' mechanism will create a symlink to the
source tree version of the file(s).

Sponsored by: The FreeBSD Foundation

Remove NO_OBJ now that this makefile builds something.

Noticed by: Andrzej Tobola

Fix a botched commit that broke world.

Add a man page for mkfilters(1) and put the corrected perl script in the
ipfilter usr/share directory

PR: docs/26879

Start the dreaded NOFOO -> NO_FOO conversion.

OK'ed by: core

For variables that are only checked with defined(), don't provide
any fake value.

FILES support for bsd.prog.mk. See bsd.README for details.

Stolen from: NetBSD

Clamp down with NOOBJ.

Add the IPFilter how-to and other related documents to the base install
so that users gets ipfilter examples without a source install.

PR: 26763
Submitted by: Cyrille Lefevre <clefevre@poboxes.com>