package/poke: new package

Backport a patch to disable tcl/tk dependencies when gui support
is disabled.

Backport and rebase a patch to avoid host poisoning while
cross-compiling.

Add another local patch when HELP2MAN is missing.

Disable uClibc-ng toolchain for now due to issues with
bundled gnulib.

The license of gnulib is not easy to describe because
it bundle several sources files with different license [1][2].
Even if not SPDX compliant, use "gnulib license".

[1] https://git.savannah.gnu.org/cgit/gnulib.git/tree/COPYING
[2] https://src.fedoraproject.org/rpms/gnulib/blob/rawhide/f/gnulib.spec#_53

See:
http://www.jemarch.net/poke-1.0-relnotes.html
http://www.jemarch.net/poke-1.1-relnotes.html
http://www.jemarch.net/poke-1.2-relnotes.html



Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Jose E. Marchesi <jemarch@gnu.org>
Cc: Luca Saiu <positron@gnu.org>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
[yann.morin.1998@free.fr:
  - propagate BR2_PACKAGE_LIBATOMIC_OPS_ARCH_SUPPORTS dependency to comment
  - select busybos-show-others
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>