contrib/atf: upgrade to 0.26HEADmain

This new version gets contrib/atf in line with the published version of
the package up on [GitHub][github].

Please note that this release is a major update: it contains several
bugfixes and feature enhancements. Most were already present in the
FreeBSD src repo, but there were a large number of changes made in
addition to what was already present.

MFC after:      1 month

Merge commit '9c78088348bcf1059d82a62bb57a0746309d4312'

Conflicts:
        contrib/atf/.cirrus.yml
        contrib/atf/Makefile.am
        contrib/atf/Makefile.in
        contrib/atf/aclocal.m4
        contrib/atf/admin/ar-lib
        contrib/atf/admin/check-style-common.awk
        contrib/atf/admin/check-style.sh
        contrib/atf/admin/compile
        contrib/atf/admin/config.guess
        contrib/atf/admin/config.sub
        contrib/atf/admin/depcomp
        contrib/atf/admin/install-sh
        contrib/atf/admin/ltmain.sh
        contrib/atf/admin/missing
        contrib/atf/atf-c++/Makefile.am.inc
        contrib/atf/atf-c++/atf-c++.3
        contrib/atf/atf-c++/atf-c++.pc.in
        contrib/atf/atf-c++/check.cpp
        contrib/atf/atf-c++/check.hpp
        contrib/atf/atf-c++/detail/Makefile.am.inc
        contrib/atf/atf-c++/detail/process_test.cpp
        contrib/atf/atf-c/Makefile.am.inc
        contrib/atf/atf-c/atf-c.3
        contrib/atf/atf-c/atf-c.pc.in
        contrib/atf/atf-c/detail/Makefile.am.inc
        contrib/atf/atf-c/detail/fs.c
        contrib/atf/atf-c/detail/fs_test.c
        contrib/atf/atf-c/detail/process_test.c
        contrib/atf/atf-c/tc.c
        contrib/atf/atf-c/tc.h
        contrib/atf/atf-sh/Makefile.am.inc
        contrib/atf/atf-sh/atf-check.cpp
        contrib/atf/atf-sh/atf-check_test.sh
        contrib/atf/bootstrap/Makefile.am.inc
        contrib/atf/bootstrap/package.m4
        contrib/atf/bootstrap/testsuite
        contrib/atf/config.h
        contrib/atf/configure
        contrib/atf/configure.ac
        contrib/atf/doc/Makefile.am.inc
        contrib/atf/doc/atf-test-case.7
        contrib/atf/m4/developer-mode.m4
        contrib/atf/m4/libtool.m4
        contrib/atf/m4/ltoptions.m4
        contrib/atf/m4/ltsugar.m4
        contrib/atf/m4/ltversion.m4
        contrib/atf/m4/lt~obsolete.m4
        contrib/atf/m4/module-defs.m4
        contrib/atf/test-programs/Makefile.am.inc

[github]: https://github.com/freebsd/atf

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